MATH 5- quarter 4-week 1 -Finding the Area of a Circle

circle is cut into 16 identical sectors as shown in the figure. What will be formed if the 16 sectors are arranged in one row?

• circle

• triangle

• parallelogram

Which figure has a formula for finding area that can be used to derive a formula of a circle?

• triangle

• trapezoid

• parallelogram

The sectors of a circle are arranged in one row. Which part of the circle approximates the bases of the resembled figure?

• area

• diameter

• circumference

The sectors of a circle are arranged in one row. Which part of the resembled shape approximates the radius of the circle?

• base

• height

• diameter

Which is half of the diameter of a circle?

• arc

• radius

• circumference

A circle with radius r is cut into several sectors which are then arranged in one row. Which is equal to the base of the resembled figure?

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• 𝑟

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If the diameter of a circle is given, what should you compute first to find its area?

• pi

• radius

• circumference

What is the formula for finding the area of a circle?

• 𝐴=𝜋×𝑟×𝑟

• 𝐴=2×𝜋×𝑟

• 𝐴=𝜋×𝑑

What is the area of a circle with a 5 cm radius? (use 𝜋=3.14)

• 78.5 cm2

• 23.7 cm2

• 15.7 cm2

What is the area of a circle with a diameter of 48 m?

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