Every triangle has an angle measure of 180 degrees.
so 42+20+x (where x is the measure of the third angle)=180
Combine like terms.
62+x=180
Subtract 62 from both sides
x=118.
Answer:
17 cm.
Step-by-step explanation:
Because 12 cm + 5 cm. is 17 cm.
Answer:A
Step-by-step explanation:
Answer:
2+x
Step-by-step explanation:
2(1-x)=2-2x
2-2x+3x=2+x