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1) L = ½ × ( a + b ) × t
L = ½ × ( 10 + 7 ) × 8
L = ½ × 17 × 8
L = 68 cm²

2) L = ½ × (a + b ) × t
24 = ½ × (6 + 10) × t
24 = ½ × 16 × t
24 = 8 × t
t = 24 ÷ 8
t = 3 cm

3) L = ½ × ( a + b ) × t
16 dm² = ½ × ( a + 48 cm ) × 40 cm
1600 cm² = ( a + 48 cm ) × 20 cm
a + 48 = 1600 ÷ 20
a + 48 = 80
a = 80 - 48
a = 32 cm

4) L = ½ × ( a + b ) × t
160 = ½ × ( 18 + b) × 8
160 = 4 × ( 18 + b)
18 + b = 160 ÷ 4
18 + b = 40
b = 40 - 18
b = 22 cm

5) L = ½ × ( a + b ) × t
255 = ½ × ( a + b ) × 15
255 = ( a + b ) × 7,5
a + b = 255 ÷ 7,5
a + b = 34 cm

1. L = ½ × ( a + b) × t
= ½ × ( 10 cm + 7 cm) × 8 cm
= ½ × 17 cm × 8 cm
= ½ × 136 cm
= 68 cm2
2. A = L × 2 : (jumlah sisi sejajar)
= 24 × 2 : ( 6 + 10)
= 48 m2 : 16 m
= 3 m
3. A = 2 × L : t - b
= 2 × 160 cm2 : 40 cm - 48 cm
= 320 cm2 : 40 cm - 48 cm
= 8 cm2 - 48 cm = 48 cm- 8 cm2
= 40 cm
4. B. = 2 × L : t - a
= 2 × 160 cm2 : 40 cm -18 cm
= 320 cm2 : 40 cm - 18 cm
= 8 cm2 - 18 cm = 18 cm - 8 cm2
= 10 cm
5. ( A + B) = 2 × L : t
= 2 × 255 dm2 : 15 dm
= 510 dm2 : 15 dm
= 34 dm

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