Answer:
see explanation
Step-by-step explanation:
Using the identities
sin(A + B) = sinAcosB + cosAsinB
cotA =
, tanA = 
Consider the left side

= 
=
+ 
= 1 +
. 
= 1 + cotA tanB = right side , thus verified
Answer:
x=45
Step-by-step explanation:
a=135
x+135=180
x=180-135
x=45
-2 = -2 because of the slope
Answer:

Step-by-step explanation:
Given that,
The base of a trapezoid, b = 21.6 m
Height of the trapezoid, h = 4.5 m
The tope of the trapezoid, a = 11.9 m
We need to find the area of a trapezoid. The formula for the area of a trapezoid can be given by :

Put all the values,

Hence, the area of a trapezoid is equal to
.