semicircles

"The recipe calls for a precise measure of baking soda. "

"The surveyor used special equipment to measure the boundaries of the new school property. "

"The sun appeared from behind the clouds. "

"A series of seemingly inconsequential events led cumulatively to the fall of the company."

"The after-school program is a great way for kids to continue learning. "

"The violinist was a master of her instrument."

"the angle between lines A and B"

"I ate the slightly smaller half of the apple."

"The parrot's feathers were colorful, with shades of green, blue, and yellow. "

"After the rain stopped, a beautiful rainbow arched across the sky. "

"The set of all points (x, y) such that (x − 1)2 + y2 = r2 is a circle of radius r around the point (1, 0)."

"We measured the temperature with a thermometer.   You should measure the angle with a spirit level."