2. a. panjang = 76÷2- 13
= 38- 13
= 25
b. panjang = 122÷2-23
= 61- 23
= 38
c. panjang = 70÷2-10
= 35-10
3.keliling = 2×(56+30)
= 2× 86
= 172
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2. a. panjang = 76÷2- 13
= 38- 13
= 25
b. panjang = 122÷2-23
= 61- 23
= 38
c. panjang = 70÷2-10
= 35-10
= 25
3.keliling = 2×(56+30)
= 2× 86
= 172
semoga membantu