To find angle BCD, find the angle ACB that lies next to it on the straight line first.
Angles in a triangle add up to 180.
To find angle ACB:
180 - 83 - 47 = 50
So angle ACB = 50.
Angles on a straight line add up to 180 as well.
So to find angle BCD:
180 - 50 = 130
So angle BCD = 130, so the answer is D.
Answer:
Step-by-step explanation:
Answer:
30°
Step-by-step explanation:
Use that
-the sum of angles in a triangle is 180° and that
-vertical angles are congruent ( angle x and the missing angle in the bottom triangle are vertical)
x= 180-75 -75 = 30°
Answer:
4x^2 + 12x + 9
Step-by-step explanation:
(2x + 3)^2
it is in the form of (a + b)^2
(a + b)^2 = a^2 + 2*a*b + b^2
(2x + 3)^2
(2x)^2 + 2*2x*3 + (3)^2
4x^2 + 12x + 9