A right angle measures 90 degrees and is the intersection of two perpendicular lines. In diagrams, a right angle is indicated by a small box completing a square with the perpendicular lines.

The formula for area is πr². Radius is circle \( \frac{diameter}{2} \):

r = \( \frac{d}{2} \)
r = \( \frac{6}{2} \)
r = 3
a = πr²
a = π(3²)
a = 9π

The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:

z² + 2z - 35 = 0
(z - 5)(z + 7) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (z - 5) or (z + 7) must equal zero:

If (z - 5) = 0, z must equal 5
If (z + 7) = 0, z must equal -7

So the solution is that z = 5 or -7

You can only add or subtract monomials that have the same variable and the same exponent. For example, 2a + 4a = 6a and 4a² - a² = 3a² but 2a + 4b and 7a - 3b cannot be combined. However, you can multiply and divide monomials with unlike terms. For example, 2a x 6b = 12ab.

The entire length of this line is represented by AD which is AB + BD:

AD = AB + BD