find the measure of all the angles of quadrilateral ABCD in the adjoining fig. 11.25. answer is angle A = 93, B = 78 , C= 115 and D = 74.
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find all angle abcd
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sum of the angles in a triangle is equal to 180°
so fist add the angles in triangle ABC so
(x+11)+(2 (2x+1))+3 (x+5)=180
x+11+4x+2+3x+15=180
8x+28=180
8x=180-28
x=152/8
x=17
so fist add the angles in triangle ABC so
(x+11)+(2 (2x+1))+3 (x+5)=180
x+11+4x+2+3x+15=180
8x+28=180
8x=180-28
x=152/8
x=17
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