kak tolong bantu no 6,7,9 pakek caranya

6.) a.) (1/2 x 36 x 15) - (1/2 x 8 x 15)
= (18 x 15) - (4 x 15)
= (270) - (60)
= 10

b.) 17 + 28 + 39 = 84

7.) L.segi3 ABC + L.segi3 ACD
= (1/2 x 8 x 15) + (1/2 x 15 x 6)
= (4 x 15) + (3 x 15)
= (60) + (45)
= 105

9.) a.) Segitiga sama kaki

b.) 2(2x - 5) + x = 40
40 = 4x - 10 + x
50 = 5x
x = 10

KM = 10
KL dan ML = (2x - 5) = 2(10) - 5 = 20 - 5 = 15