dijawab ya 10-15 plisss bangettt

10.)
180° - 40° = 140° ÷ 2 = 70°

x + 70° = 180°
x = 110°

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11.)
40° + 7x = 180°
7x = 140°
x = 20°

80° + 2y = 180°
2y = 100°
y = 50°

5z = 180° - 2y - 40°
5z = 180° - 2 × 50° - 40°
5z = 180° - 100° - 40°
5z = 40°
z = 8°

x + y + z = 20° + 50° + 8° = 78°

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12.)
b + 40° + 70° = 180°
b + 110° = 180°
b = 70°

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13.)
Panjang :
a² = s² - t²
a² = 5² - 3²
a² = 25 - 9
a² = 16
a = √16
a = 4
• panjang = 4 + 4 = 8 cm
• lebar = 3 + 3 = 6 cm

Keliling = 2 × (p + l)
= 2 × (8 + 6)
= 2 × 14
= 28 cm

Luas = p × l
= 8 × 6
= 48 cm²

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14.)
t² = s² - a²
t² = 5² - 3²
t² = 25 - 9
t² = 16
t = √16
t = 4 cm

Luas = d1 × d2 / 2
= (BO + DO) × (AO + CO) / 2
= (10 + 4) × (3 + 3) / 2
= 14 × 6 / 2
= 42 cm²

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15.)
14 - 9 = 5

Panjang DC :
s² = a² + t²
s² = 5² + 12²
s² = 25 + 144
s² = 169
s = √169
s = 13 cm

Keliling ACDE :
= AE + AC + ED + DC
= 12 + 14 + 9 + 13
= 48 cm