Jawapan

2016-08-07T16:17:51+08:00
A) sin teta = 5/8 , teta = 38°41` , b) r = A/teta (formula) , Angle OST = 180° - 38°41` - 90° = 51°19` , Angle PST = 180° - 51°19` = 128°41` , rad = pai/180 × 128°41` , rad = 2.246 , 5 = A/2.246 , A = 11.23 cm (PT) , 13 = A/0.6752 , A = 8.7776 cm (PQ) , OT = 8^2 - 5^2 (square root) = 6.245 cm , TQ = 13 - 6.245 = 6.755 cm , Perimeter = 6.755 + 11.23 + 8.7776 = 26.76 , c) A = 1/2 × 13^2 × 0.6752 = 57.05 cm^2 , B = 6.245 × 5 × 1/2 = 15.61 cm^2 , C = 1/2 × 5^2 × 2.246 = 28.075 cm^2 , Area = 57.05 - 15.61 - 28.075 = 13.365 cm^2