One of the base angles of an isosceles triangle is 70°, and the vertex angle is 5x+5. What are the measures of x and the vertex angle? *

140+2×=180--> 2×=40 --> × = 20 by substitution we found that <F * 2 = 140 and angle f =79 degrees

answer: 48

just remember to use pemdas:

parentheses

expressions

multiplication

division

addition

subtraction

(2x + 16) + (x) = 180

step-by-step explanation:

given,

abcd is a quadrilateral inscribed in a circle

angle a is labeled x plus 16, (x + 16)

angle b is labeled x degrees, (x)

angle c is labeled 6x minus 4, (6x – 4)

angle d is labeled 2x plus 16, (2x + 16)

what equation can be used to solve for angle b?

we know that the sum of the opposite angles of a simple quadrilateral inscribed in a circle is 180 degrees.

angle b is opposite angle d

therefore, angle b + angle d = 180

(x) + (2x + 16) = 180 

same as (2x + 16) + (x) = 180