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1 = ( +1) BP AC = AP + (1+ )BP Proved UNIT9 CIRCLES 1. Prove that the parallelogram circumscribing a circle is rhombus. Ans Given : ABCD is a parallelogram circumscribing a circle. To prove :  ABCD is a rhombus or AB=BC=CD=DA Proof: Since the length of tangents from external are equal in length AS = AR..(1) BQ = BR..() QC = PC..(3) SD = DP..(4) Adding (1), (), (3) & (4). AS + SD + BQ + QC = AR + BR + PC + DP AD + BC = AB + DC AD + AD = AB + AB Since BC = AD & DC = AB (opposite sides of a parallelogram are equal) AD = AB AD = AB..(5) BC = AD (opposite sides of a parallelogram) DC = AB..(6) From (5) and (6) AB = BC = CD = DA Hence proved. A circle touches the side BC of a triangle ABC at P and touches AB and AC when produced at Q and R respectively as shown in figure. Show that AQ= (perimeter of triangle ABC) A B P C Q R 75
2 Since the length of tangents from external point to a circle are equal. AQ = AR BQ = BP PC = CR Since AQ = AR AB + BQ = AC + CR AB + BP = AC + PC (Since BQ = BP & PC = CR) Perimeter of ABC = AB + AC + BC = AB + BP + PC + AC = AQ + PC + AC (Since AB + BP = AQ) = AQ + AB + BP (Since PC + AC = AB + BP) = AQ + AQ (Since AB + BP = AQ) Perimeter of ABC = AQ AQ = 1 (perimeter of triangle ABC) 3. In figure, XP and XQ are tangents from X to the circle with centre O. R is a point on the circle. Prove that XA+AR=XB+BR Since the length of tangents from external point to a circle are equal XP = XQ PA = RA BQ = BR 76
3 XP = XQ XA + PA = XB + BQ XA + AR = XB + BR ( Θ PA = AR & BQ = BR) Hence proved 77
4 4. In figure, the incircle of triangle ABC touches the sides BC, CA, and AB at D, E, and F respectively. Show that AF+BD+CE=AE+BF+CD= triangle ABC), (perimeter of Since the length of tangents from an external point to are equal AF = AE FB = BD EC = CD Perimeter of ABC Perimeter of ABC = AB + BC+ AC = AF + FB + BD + DC + AE + EC = AF + BD + BD + CE + AF + CE (Θ AF=AE, FB=BD, EC=CD) = AF + AF + BD + BD + CE + CE = (AF + BD+ CE) AF + BD + CE = 1 (perimeter of ABC)..(1) Perimeter of ABC = AB + BC + AC = AF + FB + BD + DC + AE + EC = AE + BF + BF + CD + AE + CD (Θ AF = AE, FB = BD, EC = CD) = AE + AE + BF + BF + CD + CD Perimeter of ABC = (AE + BF + CD) AE + BF + CD = 1 (perimeter of ABC)..() From (1) and () AF + BD + CE = AE + BF + CD = 1 (perimeter of ABC) 78
5 5. A circle touches the sides of a quadrilateral ABCD at P, Q, R and S respectively. Show that the angles subtended at the centre by a pair of opposite sides are supplementary. To prove : AOB + DOC = 180 o BOC + AOD = 180 o Proof :  Since the two tangents drawn from an external point to a circle subtend equal angles at centre. 1 =, 3 = 4, 5 = 6, 7 = 8 but = 360 o ( ) = 360 o = 360 o AOB + DOC = 180 o Similarly = 360 o ( ) = 360 o = 180 o BOC + AOD = 180 o Hence proved 6. In figure, O is the centre of the Circle.AP and AQ two tangents drawn to the circle. B is a point on the tangent QA and PAB = 15, Find POQ. ( 15 o ) O P Q 15 A B Given PAB = 15 o To find :  POQ =? Construction :  Join PQ Proof :  PAB + PAQ = 180 o (Linear pair) PAQ + 15 o = 180 o PAQ = 180 o  15 o PAQ = 55 o Since the length of tangent from an external point to a circle are equal. PA = QA From PAQ APQ = AQP 79
6 In APQ APQ + AQP + PAQ = 180 o (angle sum property) APQ + AQP + 55 o = 180 o APQ = 180 o 55 o (Θ APQ = AQP) 15 o APQ = 15 o APQ = AQP = OQ and OP are radii QA and PA are tangents OQA = 90 o & OPA = 90 o OPQ + QPA = OPA = 90 o (Linear Pair) 15 o OPQ + =90 o OPQ = 90 o 15 o o o 15 = 55 o OPQ = Similarly OQP + PQA = OQA 15 o OQP + =90 o OQP = 90 o 15 o  55 o OQP = In POQ OQP + OPQ + POQ = 180 o (angle sum property) o o POQ = 180 o 110 POQ + =180 o POQ =180 o o o 110 POQ = 50 o POQ = 80
7 POQ =15 o POQ =15 o 7. Two tangents PA and PB are drawn to the circle with center O, such that APB=10 o. Prove that OP=AP. Given :  APB = 10 o Construction : Join OP To prove : OP = AP Proof : APB = 10 o APO = OPB = 60 o Cos 60 o AP = OP 1 AP = OP OP = AP Hence proved 8. From a point P, two tangents PA are drawn to a circle with center O. If OP=diameter of the circle show that triangle APB is equilateral. PA=PB (length of tangents from an external point From OAP, OA 1 sin APO = = OP Since OP = OA (Since OP=Diameter) APO = 30 o since APO BPO APO = BPO = 30 o APB = 60 o APB is equilateral 9. In the given fig OPQR is a rhombus, three of its vertices lie on a circle with centre O If the area of the rhombus is 3 3 cm. Find the radius of the circle. QP = OR OP = OQ OPQ is a equilateral. area of rhombus = (ar of OPQ) 3 3 = 3r 4 Q P R O 81
8 3r 3 3 = r = 3 x = 64 r = 8cm Radius = 8cm 10. If PA and PB are tangents to a circle from an outside point P, such that PA=10cm and APB=60 o. Find the length of chord AB. Self Practice 11. The radius of the in circle of a triangle is 4cm and the segments into which one side is divided by the point of contact are 6cm and 8cm. Determine the other two sides of the triangle. a = BC = x + 8 b = AC = = 14cm c = AB = x + 6 a + b + c Semi perimeter = BC + AC + AB = x x + 6 = x + 8 = = x + 14 Area of ABC = s( s a)( s b)( s c) on substituting we get = ( x + 14)(6)( x)(8) O ( 15, 13) 8
9 = ( x + 14)(48x)..(1) Area of ABC = area AOB + area BOC + area AOC 1 1 area AOC = b.h = x 4 x 14 = 8 On substituting we get area ABC = area AOC + area BOC + area AOB = 4x + 56 () From (1) and () 4x + 56 = ( x + 14)(48x) Simplify we get x = 7 AB = x + 6 = = 13cm BC = x + 8 = = 15cm 1. A circle is inscribed in a triangle ABC having sides 8cm, 10cm and 1cm as shown in the figure. Find AD, BE and CF. (Ans :7cm,5cm,3cm) Self Practice 13. Prove that the intercept of a tangent between two parallel tangents to a circle subtends a right angle at the centre. Since ADF DFC ADF = CDF ADC = CDF Similarly we can prove CEB = CEF Since l m ADC + CEB = 180 o CDF + CEF = 180 o 83
10 CDF + CEF = 90 o In DFE DFE = 90 o 14. Prove that opposite sides of a quadrilateral circumscribing a circle subtend supplementary angles at the centre of the circle. Same as question No QR is the tangent to the circle whose centre is P. If QA RP and AB is the diameter, prove that RB is a tangent to the circle. A Q Self Practice R B 84
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UNIT9 1. Prve that the parallelgram circumscribing a circle is rhmbus. Ans Given : ABCD is a parallelgram circumscribing a circle. T prve :  ABCD is a rhmbus r ABBCCDDA Prf: Since the length f tangents
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