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= √26²-10²
= √(26-10)(26+10)
= √16. 36
= 4. 6
= 24 cm
L BOC = 1/2. OC.BC
= 1/2. 10.24
= 1/2. 240
L OABC = 2.L BOC
= 2. 1/2. 240
= 240 cm²
14. PQ = GSL = √RS²-(PR-QS)²
40 = √RS²-(13-4)²
40² = RS²-9²
RS² = 40²+90²
RS = √1600+81
= √1681
= 41 cm
15. GSL = √AB²-(R+r)²
12 = √15²-(13-r)²
12² = 15²-(13-r)²
144 = 225 -(13-r)²
(13-r)² = 225-144
= 81
13-r = 9
r = 13-9
= 4 cm
16. JS = GSD = √OP²-(OJ+SP)²
= √15²-(8+4)²
= √225-144
= √81
= 9 cm
17. GSD = √AB - (R+r)²
24 = √30²-(R+6)²
24² = 30²-(R+6)²
(R+6)² = 30²-24²
R+6 = √30²-24²
= √(30-24)(30+24)
= √6.54
= √6.6.9
= 6. 3
= 18
R = 18-6
= 12 cm