jawab sebisa kalian..

No 7 .

Luas Segitiga = 1/2 × Alas × Tinggi
Luas Segitiga = 1/2 × 8 × 10
Luas Segitiga = 4 × 10 = 40 cm²

6. (x + 15) + (3x + 10) + 35 = 180°
4x + 60 = 180
4x. = 180 - 60
4x. = 120
x. = 120/4
x. = 30
7. L = 1/2 x alas x tinggi
= 1/2 x 8 x10
= 40