PQR is the diagram of a semicircle RSP with centre at Q and radius of length 3.5cm. If QPT = 60o. Find the perimeter of the figure PTRS. (pi) = (frac{22}{7})
-
A.
25cm -
B.
18cm -
C.
36cm -
D.
29cm -
E.
25.5cm
Correct Answer: Option A
Explanation
Circumference of PRS = (frac{pi}{2}) = (frac{22}{7}) x (frac{7}{1}) x (frac{1}{2})
= 11cm
Side PT = 7cm, Side TR = 7cm
Perimeter(PTRS) = 11cm + 7cm + 7cm
= 25cm