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a × t = 884
26 × t = 884
t = 884 : 26
t = 34 cm
b. L = 180
1/2 × (a + b) × t = 180
1/2 × (15 + b) × 10 = 180
5 × (15 + b) = 180
15 + b = 180 : 5
15 + b = 36
b = 36 - 15
b = 21 cm
c. L = 225
1/2 × d1 × d2 = 225
1/2 × 25 × d2 = 225
25/2 × d2 = 225
d2 = 225 : 25/2
d2 = 225 × 2/25
d2 = 18 cm
d. L = 216
1/2 × d1 × d2 = 216
1/2 × 16 × d2 = 216
8 × d2 = 216
d2 = 216 : 8
d2 = 27 cm
e. L = 78
1/2 × a × t = 78
1/2 × a × 12 = 78
6 × a = 78
a = 78 : 6
a = 13 cm