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Please explain this.

Please Explain This class=

Sagot :

Angles EBA and DBC are congruent. The three angles EBA, EBD, and DBC are together supplementary, so their measures sum to 180°. This means

x + (4x + 11°) + x = 180°

6x + 11° = 180°

6x = 169°

x = (169/6)°

Then the measure of angle D is

2x + 8° = 2 (169/6)° + 8° = (193/3)°

The interior angles of any triangle sum to 180°, so if y is the measure of angle C, we have

(169/6)° + (193/3)° + y = 180°

y = (175/2)° = 87.5°