AC Lim's answer to Rui Er's Primary 6 Maths Geometry Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
AC Lim
Ac Lim's answer
12485 answers (A Helpful Person)
1st
Radius = 20
Quarter circle area = ¼ × 3.14 × 20²
= 314 cm²

Area of triangle = ½ × 20 × 10 = 100cm²

Shaded area= 314 - 100 - 100 = 114cm²