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= (17+26) × 14 ÷ 2
= 43 × 14 ÷ 2
= 602 ÷2
= 301 (d)
2. L = (a+b) × t ÷ 2
= (23+11) × 16 ÷ 2
= 34 × 16 ÷ 2
= 544 ÷ 2
= 272 (c)
3. L = d1 × d2 ÷ 2
= 24 × 36 ÷ 2
= 864 ÷ 2
= 432 (f)
4. L = d1 × d2 ÷ 2
= 17 × 28 ÷ 2
= 476 ÷ 2
= 238 (a)
5. L = d1 × d2 ÷ 2
= 18 × 27 ÷ 2
= 486 ÷ 2
=243 (b)
1. L = (a+b) × t ÷ 2
= (14+20) × 14 ÷ 2
= 24 × 14 ÷ 2
= 336 ÷ 2
= 168
2. L = d1 × d2 ÷ 2
= 12 × 24 ÷ 2
= 288 ÷ 2
= 144
3. L = (a+b) × t ÷ 2
= (13+5) × 10 ÷ 2
= 18 × 10 ÷ 2
= 180 ÷ 2
= 90