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maths question
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Answer:
155
Step-by-step explanation:
(a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca
(a+ b + c)2 = a2 + b2 + c2+ 2 (ab + bc + ca)
(20)2 = 90 + 2 (ab + bc + ca)
400 - 90 = 2 (ab + bc + ca)
310/2 = ab +bc+ca
ab + bc + ca = 155
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