Trapezia and circles Flashcards
(14 cards)
What is the formula for the circumference of a circle?
C = 2πr, where r is the radius.
True or False: The diameter of a circle is twice the radius.
True.
What is the area formula for a circle?
A = πr², where r is the radius.
Fill in the blank: The radius of a circle is half of the ______.
diameter.
What is the formula for the area of a trapezium?
A = 1/2 × (a + b) × h, where a and b are the lengths of the parallel sides and h is the height.
If a circle has a radius of 5 cm, what is its area?
78.54 cm².
What is the relationship between the radius and diameter of a circle?
The diameter is twice the radius.
True or False: A trapezium can have two parallel sides.
True.
Calculate the circumference of a circle with a diameter of 10 cm.
31.42 cm.
What is the height in a trapezium?
The perpendicular distance between the two parallel sides.
Multiple Choice: What is the area of a circle with a radius of 3 cm? A) 9π B) 6π C) 3π
A) 9π.
If a trapezium has bases of 4 cm and 6 cm, and a height of 3 cm, what is its area?
15 cm².
Fill in the blank: The circumference of a circle is measured in ______.
units of length.
True or False: The area of a circle increases with the square of the radius.
True.
