Question

find missing angle of triangle question 10 show me how to do it please.
http://cdn.kutasoftware.com/Worksheets/Geo/4-Angles%20in%20a%20Triangle.pdf

Answer 1

sum of angles of triangles = 180 degrees

1. 65 + 57 + x = 180
x = ?

Answer 2

58

Answer 3

Correct.
apply same formula in 2,3 and 4
then what will be your answers for those?

Answer 4

can you help me with question 10

Answer 5

60 +65 +x = 180
x = ?

x +50 +y = 180 (straight line angle is 180 degree)

35 +y + z = 180 (sum of angles of triangle )


another method is
x+50 = 35 + z (exterior angle = sum of opposite interior angle)

Answer 6

what will be your answer then?

Answer 7

how do you find y

Answer 8

x+50 + y = 180 (angle of straight line)

we found x by
60 +65 + x = 180 (sum of angles of triangle)

Answer 9

answer is 70

Answer 10

Thats correct :)

Answer 11

number 13

Answer 12

85 + x = 115 (exterior angle = sum of opposite interior angles)

x +90 + y = 180 (straight line is of 180 degree)

y + q = 155 (exterior angle = sum of opposite interior angles)

q+r +y = 180 ( sum of angle of triangles)

q+r = z (exterior angle = sum of opposite interior angles)