NABIL EL EUCH's answer to Dee's Secondary 1 Maths Singapore question.
For area, I am using
Bigger half circle - smaller half circle
½ × 2 × π x 7.5 - ½ × 2 × π x 6
= 1.5π
Bigger half circle - smaller half circle
½ × 2 × π x 7.5 - ½ × 2 × π x 6
= 1.5π
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