Area & Circumference of Circles
Boost circle math skills! Practice finding area and circumference.
Whats the Relationships Between Radius Diameter? Match the Radius with it's corresponding Diameter! Radius = 4 Diameter = 8 Radius = 7 Diameter = 14 Radius = 9 Diameter = 18 Radius = 13 Diameter = 26 Radius = 17 Diameter = 34 Fill in the Blanks! 1) The radius is equal to half the diameter2) The diameter is equal to twice the radius.3) To calculate the Circumference with the radius, we would use C = 2𝝿r4) To calculate the Circumference with the diameter, we would use C = 𝝿d If the radius of a circle is equal to 8, what will the circumference be? Type your step by step process for solving for circumference. Tyrese is curious how many inches of crust his pizza has. He measures the radius of the pizza as 10 inches. How many inches of crust does he have? 20 31.4 62.8 314 Alex's dining room table is circular with a radius of 48 inches. If each chair requires at least 50 inches of space along the table's perimeter, how many chairs can Alex buy for his table? 4 chairs 5 chairs 6 chairs 7 chairs If the diameter of a circle is equal to 32, what will the circumference be? Type your step by step process for solving for circumference. Jaime is getting a round pool in her backyard!!! But her dad is making her mark the perimeter of the pool before they dig the hole. If the diameter of the pool is equal to 40 feet, what is the perimeter of the hole going to be? Type your step by step process for solving for circumference. Marcus is making a hula hoop for his little sister. She's younger than him so it can't be too big. He decides that at it's widest, it can be 36 inches across. Calculate the circumference of the hula hoop. 36 inches 56.52 inches 113.04 inches 226.08 inches The circumference of a circle is 78.5 inches. Calculate the radius of the circle. Type your step by step process for solving for the radius. Abby is tasked with selecting a tire for her community playground's tire swing. She decides that for 4 kids to sit on it, the tire swing must be 144.44 inches around. Oh no! Tires are listed by their diameter's online. What is the diameter of the tire swing she needs to order? 23 inches 46 inches 92 inches Cheryl is really into making her Halloween costume each year. She wants to go as a knight this year complete with a sword and shield! She's trying to figure out what size plastic circle to buy online. She decides she can hold a circle with a circumference of 50.24 inches, what is the radius of the plastic circle? Type your step by step process for solving for the radius. If the radius of the circle is 9, what will the area of the circle be? Type your step by step process for solving for the Area. If the radius of the circle is 14, what will the area of the circle be? Type your step by step process for solving for the Area. Samara is buying a round planter for her garden. There are two options for planters. Option A has a radius of 8 inches. Option B has a radius of 10 inches. Samara wants to buy the smaller of the two, but needs her planter to have at least 200 square inches of area. Which should she buy? Planter A Planter B If the diameter of the circle is 12, what will the area of the circle be? Type your step by step process for solving for the Area. Jaime and her round pool are back! If the diameter of the pool is equal to 40 feet, what is the area of the hole for her pool going to be? Type your step by step process for solving for circumference. If the diameter of the circle is 20, what will the area of the circle be? 31.4 314 62.8 1,256 If the area of a circle is 78.5, what is the radius of the circle? Type your step by step process for solving for the radius. If the area of a circle is 153.86, what is the radius of the circle? Type your step by step process for solving for the radius. If the area of a circle is 452.16, what is the diameter of the circle? Type your step by step process for solving for the radius.