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Երկրաչափություն

346

Տրված է՝

c=13

b=5

c=?

a²+b²=c²

a²= c²-b²

169-25=c²

c²=144

c=12

347

Տրված է՝

c=17

b=8

a=?

S=?

a²=c²-b²

a²=289-64

a²=225

a=15

S=15*8=120

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