Question

Calculate the size of each lettered angle.

Note: If you don't know the correct answer, please don't give the wrong answer.

Question number 7 and 8 must be answered.

Answer 1

Step-by-step explanation:

7. a=40° [alt. angles]

in quadrilateral,

40°+77°+b+130°=360°

b=360-247

b=113