Math, asked by parmesarpurohit, 10 months ago

∆B = 90°, ∆C = 70°; BC = 4 cm​

Answers

Answered by vainalapadma
1

Answer:

∆A=20

Step-by-step explanation:

90+70=180-∆A

160=180-A

∆A=180-160

∆A=20

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