Question

ARE YOU GOOD AT GEOMETRY??? STEP RIGHT UP AND ANSWER THIS QUESTION!!

ALL HELP IS APPRECIATED!!!

Answer 1

130 degrees

Explanation:

We know that the triangle is isosceles, so the two base angles will be equal. We will call the base angles "x." There are also 180 degrees in a triangle, so we can write this equation:

80 + 2x = 180

2x = 100

x = 50

Now we know that both base angles are 50 degrees. A straight line is 180 degrees, so to find angle DCB, we have to subtract angle C from 180.

180 - 50 = 130

Answer 2

130°

Explanation:

Since triangle ABC is isosceles, angles A and C are equal. From this we can deduce that they are both (180-80)/2=50 degrees. Since ACD is a straight line, it has an angle of 180 degrees. Subtracting the 50 degrees in angle C, we get that angle DCB=130 degrees.