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Jumlah sisi sejajar x tinggi / 2
( 10 + 20 ) 17 /2
30 × 17 /2 = 510 /2 = 255 cm^2
Luas bangun kedua (persegi panjang)
p x l
20 × 18 = 360 cm^2
Luas seluruhnya
255 cm^2 + 360 cm^2 = 615 cm^2 (D)
= p × l
= 20 × 18
= 360 cm2
luas trapesium
= (a + b ) × t ÷ 2
= (20 + 10 ) × 17 ÷ 2
= 30 × 17 ÷ 2
= 255 cm2
360 cm2 + 255 cm2
= 615 cm2