geometry number 17 and 18 only ..show work please

Mathematics
Tutor: None Selected Time limit: 1 Day

Nov 13th, 2014

17.  If triangle ABD is congruent to triangle CBD, then we know that the angle 4x + 10 = 90.  Solving for x, we get 4x = 80.

x = 80/4 = 20.

Now we can solve for the measure of angle C.  Given that x = 20, angle C = x + 11 = 20 + 11 = 31.


18.  Corresponding sides in congruent triangles are congruent.  So, the side labeled with y - 7 is equal to the side labeled 12.

y - 7 = 12

y = 12 + 7 = 19

Nov 13th, 2014

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