Topic 10: Flashcard

Front

What is the perimeter of a triangle with sides measuring 18 cm, 18 cm, and 18 cm?

Back

The perimeter is 54 cm.

Front

How do you find the area of a shaded sector of a circle?

Back

To find the area of a shaded sector, use the formula: \( \text{Area} = \frac{\theta}{360} \times \pi r^2 \), where \( \theta \) is the angle in degrees and \( r \) is the radius.

Front

What is the formula for arc length in a circle?

Back

The arc length \( L \) can be calculated using the formula: \( L = \frac{\theta}{360} \times 2\pi r \), where \( \theta \) is the angle in degrees and \( r \) is the radius.

Front

If a line is tangent to a circle, what can be said about the radius at the point of tangency?

Back

The radius at the point of tangency is perpendicular to the tangent line.

Front

What is the relationship between the angles formed by two tangents drawn from a point outside a circle?

Back

The angles formed by two tangents drawn from a point outside a circle are equal.

Front

How do you calculate the area of a circle?

Back

The area of a circle is calculated using the formula: \( A = \pi r^2 \), where \( r \) is the radius.

Front

What is the value of \( \pi \)?

Back

The value of \( \pi \) is approximately 3.14.

Front

What is the formula for the circumference of a circle?

Back

The circumference \( C \) is calculated using the formula: \( C = 2\pi r \), where \( r \) is the radius.

Front

If the radius of a circle is doubled, how does the area change?

Back

If the radius is doubled, the area increases by a factor of four.

Front

What is the formula for the area of a triangle?

Back

The area \( A \) of a triangle is calculated using the formula: \( A = \frac{1}{2} \times \text{base} \times \text{height} \).