WAEC - Mathematics (1998 - No. 44)
Calculate the perimeter of the trapezium PQRS
24cm
36cm
48cm
72cm
520cm
Giải thích
Using Pythagora's rule for △PSM
Hyp\(^2\) = Opp\(^2\) + Adj\(^2\)
5\(^2\) = Opp\(^2\) + 4\(^2\)
→ Opp\(^2\) = 25 - 16
→ Opp = √9 = 3
base SR = 18 + 3 = 21
base PQ = 18
side PS = 5
side QR = 4
perimeter of the trapezium PQRS = 21 + 18 + 5 + 4 = 48cm