no 18 19 20 please jawab makasih

•18

L = (a+b) x t x ½
60 cm² = (a+b) x 6 cm x ½
60 cm² = (a+b) x 3 cm
a+b = 60 cm²/3 cm
a+b = 20 cm

a = 20 cm x 2/5
a = 8 cm

b = 20 cm x 3/5
b = 12 cm

•19

<A+<B+<C = 180°
4x+10+5x-30+6x-40 = 180°
4x+5x+6x = 180°-10°+30°+40°
15x = 240°
x = 240°/15
x = 16°

<A = 4.16+10 = 74°

<B = 5.16-30 = 50°

<C = 6.16-40 = 56°

•20

L = d¹ x d² x ½
48 cm² = 2x . 3x . ½
48 cm² = 2 ½x
x = ✓48 cm²/2 ½ = 4,38 cm

d¹ = 2 . 4,38
d¹ = 8,76 cm

d² = 3 . 4,38
d² = 13,14 cm



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