1. Find the area of a circle whose diameter is 5.1 centimeters (cm). Use 3.14 for ƒàƒnand round your answer to the nearest tenth of a square centimeter.

2.A triangle has base 13 feet (ft) and an altitude of 6 ft. Find its area

1. The area of a circle is found by multiplying pi times the radius squared.

A = pi * r^2

In a circle with a diameter of 5.1 cm, the radius is 2.55 cm.

A = 3.14 * 6.5025
A = ??

2. The area of a triangle is found by multiplying 1/2 the base times the height.

A = 1/2 * 13 * 6
A = ??

If you post your answers, we'll be glad to check them.

I think the anwser would be 78

1. To find the area of a circle, we can use the formula A = ƒàƒn * r^2, where A is the area and r is the radius of the circle.

Given that the diameter of the circle is 5.1 cm, we can find the radius by dividing the diameter by 2.

Radius = Diameter / 2 = 5.1 cm / 2 = 2.55 cm

Using the formula, we can calculate the area:

A = 3.14 * (2.55 cm)^2
= 3.14 * 6.5025 cm^2
= 20.41305 cm^2

Rounding to the nearest tenth of a square centimeter, the area of the circle is 20.4 cm^2.

2. The area of a triangle can be found using the formula A = 1/2 * b * h, where A is the area, b is the base, and h is the altitude.

Given that the base of the triangle is 13 ft and the altitude is 6 ft, we can calculate the area:

A = 1/2 * 13 ft * 6 ft
= 1/2 * 78 ft^2
= 39 ft^2

Therefore, the area of the triangle is 39 square feet.

To find the area of a circle, you need to use the formula: A = πr². However, since we are given the diameter of the circle, we first need to find the radius.

1. Diameter = 5.1 cm
Radius = Diameter / 2
= 5.1 cm / 2
= 2.55 cm

Now that we have the radius, we can substitute it into the formula and calculate the area.

A = πr²
= 3.14 * (2.55 cm)²
= 3.14 * (2.55 cm) * (2.55 cm)
≈ 20.376 cm²
≈ 20.4 cm² (rounded to the nearest tenth)

Therefore, the area of the circle is approximately 20.4 square centimeters.

To find the area of a triangle, you need to use the formula: A = (1/2)bh, where "b" represents the length of the base and "h" represents the height or altitude of the triangle.

2. Base = 13 ft
Altitude = 6 ft

A = (1/2) * 13 ft * 6 ft
= 6.5 ft * 6 ft
= 39 ft²

Therefore, the area of the triangle is 39 square feet.