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= 1/2 × (a+b) × t
= 1/2 × (14+21) × 9
= 1/2 × 35 × 9
= 1/2 × 315
= 157,5 dam²
Luas bangun 2 - ½ Luas lingkaran
= 1/2 × 1/4 × Π × d²
= 1/2 × 1/4 × 22/7 × 21²
= 1/2 × 1/4 × 22/7 × 441
= 1/2 × 1/4 × 1.386
= 1/4 × ( 1/2 × 1.386)
= 1/4 × 693
= 173,25 dam²
maka Luas gabungannya adalah 157,5 dam² + 173,25 dam² = 330,75 dam²
Mohon koreksinya jika salah.