Question

How do I find the missing side of an isosceles triangle if A=42 and B=42. How do I find C?

A.
42°
B.
69°
C.
74°
D.
132°

Answer 1

did you leave something out?

Answer 2

In a triangle, if two sides are congruent, then the opposite angles are congruent.
This can be restated as: The base angles of an isosceles triangle are congruent.

Answer 3

So m<C = 42?

Answer 4

The sum of the measures of the 3 angles is 180 deg.
x + x + 42 = 180

Answer 5

A triangle must=180Deg

Answer 6

No. m<C is not 42.
Solve the equation below.
2x + 42 = 180
Solve for x.

Answer 7

If <C=42 then <B Would have to= 42 as <C and B are = To each other Meaning <A <B and <C together would = 126 deg which couldnt be possible, Dont just throw out random numbers Look at the picture surly <A Could not= <C

Answer 8

I am going to put in in simple terms. O
kay <C and <B must be the same or = each other.
We know <A is 42 Degrees and can not= the same as <C and B.
So to Find Do 180-42 Because a triangle= 180 and we already know m<A
You will get 138 Now Divide by 2 because there are 2 angles left/ <C and <B
You will get 69
So < C and <B both = 69
<C =69

Answer 9

Thank you @aric200 ! :)

Answer 10

2x + 42 = 180
2x = 138
x = 69