A trapezoid is a quadrilateral with one set of parallel sides.

A rhombus is a parallelogram with four equal-length sides. A square is a rectangle with four equal-length sides.

The volume of a cylinder is πr²h:

v = πr²h
v = π(5² x 6)
v = 150π

An exterior angle of a triangle is equal to the sum of the two interior angles that are opposite:

d° = b° + c°

To find angle c, remember that the sum of the interior angles of a triangle is 180°:

180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 43° - 45° = 92°

So, d° = 45° + 92° = 137°

A shortcut to get this answer is to remember that angles around a line add up to 180°:

a° + d° = 180°
d° = 180° - a°
d° = 180° - 43° = 137°

The area of a rectangle is equal to its length x width:

a = l x w
a = a x b
a = 7 x 3
a = 21