harey

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90 70= 20 deg using side of square as "a" , we have tan20 = o/a and then O= atan 20 or 0.3639a; The right leg of the triangle and the top portion of the right side 20 +45 =65 ; 9065 = 25 degrees the other angle at top left and therefore the 3rd angle is 65; tan 25 = o/a or o = a tan25; o = 0.4663a. since a is the length of a side then the bottom leg of the lower right triangle = 1  0.4663 = 0.5336a ; the vertical leg of the lower triangle is 1  0.3639a = 0.6360a. we will designate the left angle of the bottom triangle as Y , So we can say Tan Y = o/a or 0.6360a / 0.5336a; tan Y = 1.1917; Y = 50 Adding the bottom angles we have 65 + 50 = 115 : 180  115 =65 degrees X = 65 degrees