Answer:
Step-by-step explanation:
in complementary angle, the sum of two angle is always 90 degree.
let another angle be x
x+78.7=90
x=90-78.7
x=11.3
therefore anothere angle is 11.3 degree.
Answer:
2
Step-by-step explanation:
10! = 3628800
Step-by-step explanation:
An exterior angle of a triangle is equal to the sum of the opposite interior angles.
I will do the first problem as an example:
10x − 7 = x + 17 + 75
10x − 7 = x + 92
9x = 99
x = 11