Theproblemsolver
Theproblemsolver
15-05-2016
Mathematics
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penfila11Pen
penfila11Pen
15-05-2016
∠D = 90°
∠E = x
∠F = 2x - 12
Angles in a triangle = 180°
90 + x + 2x - 12 = 180
78 + 3x = 180
-78 -78
3x = 102
[tex] \frac{3x}{3} = \frac{102}{3} [/tex]
3 and 3 cancels out
34 = x
∠E = 34°
∠F = 2x -12
= 2 × 34 - 12
= 56°
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