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Find the sum of ∠a, ∠b, ∠c and ∠d in the following image?

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Find the sum of ∠a, ∠b, ∠c and ∠d in the following image?
enter image description here

posted Feb 11 by anonymous
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1 Answer

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290 degrees
.
De sum of the inner angles of a triangle is 180 degrees.
There are 2 triangles = 360 degrees.
360 - 70 = 290 degrees

answer Feb 11 by Jcm

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