13.) 2 × ½ bh + s²
= 2 × { ½ × [ ( 20 - 12 ) / 2 ] × 12 } + 12 ²
= 2 × [ ½ × ( 6 / 2 ) × 12 ] + 12 ²
= 2 × ( ½ × 3 × 12 ) + 12 ²
= 2 × 18 + 144
= 36 + 144
= 180 cm ²
14.) πr² + πr²
= ( 3.14 ) × ( 7² ) + ( 3.14 ) × ( 14² )
= ( 3.14 ) × ( 49 ) + ( 3.14 ) × ( 196 )
= 153.86 + 615.44
= 769.30 cm ²
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Solution & Answer.
13.) 2 × ½ bh + s²
= 2 × { ½ × [ ( 20 - 12 ) / 2 ] × 12 } + 12 ²
= 2 × [ ½ × ( 6 / 2 ) × 12 ] + 12 ²
= 2 × ( ½ × 3 × 12 ) + 12 ²
= 2 × 18 + 144
= 36 + 144
= 180 cm ²
14.) πr² + πr²
= ( 3.14 ) × ( 7² ) + ( 3.14 ) × ( 14² )
= ( 3.14 ) × ( 49 ) + ( 3.14 ) × ( 196 )
= 153.86 + 615.44
= 769.30 cm ²