Answer:
Step-by-step explanation: That is a 90 degree angle. Using L is an example of a 90 degree angle, or a right angle, which is its common name.
Answer:
B
Step-by-step explanation:
Inside the figure is a right triangle with hypotenuse 18 cm. Its height is half the measure of the side length. 18.2 is 9 cm. Using 9 cm and 18 cm, substitute the values into the Pythagorean theorem.

I've been answering lots of questions and this one's hard