WAEC - Mathematics (2017 - No. 37)
The diagram shows a circle centre O. if <STR = 29º and < RST = 46º, Calculate the value of <STO.
12\(^o\)
15\(^o\)
29\(^o\)
34\(^o\)
설명
SOT = 2 x 46 (< at the centre is twice < at circumference) = 92
2x + 92 = 180( sum of
x = \(\frac{180- 92}{2}\) = 44º
< STO = 44º - 29º
= 15\(^o\)