30. It's the Base Area times the height.
It is: 3*4 = 12 square feet
The answer will depend on which of the three measures is the height. Ignore that one and multiply the other two to get the base area.
The base area = 3 x 4 = 12 square cm. The volume = 1/3 height x base area = 1/3 x 5 x 12 = 20 cubic cm.
The area of such a prism is Bh/3, where B is the base area, and h is the height (perpendicular to the plane that contains the base area).The area of such a prism is Bh/3, where B is the base area, and h is the height (perpendicular to the plane that contains the base area).The area of such a prism is Bh/3, where B is the base area, and h is the height (perpendicular to the plane that contains the base area).The area of such a prism is Bh/3, where B is the base area, and h is the height (perpendicular to the plane that contains the base area).
Area=18. Area= Base * height / 2 (12*3)/2
Area = Base*Height so Base = Area/Height = 36/3 = 12 feet
Area = 12 sqyds
Area of trapezoid: 0.5*(5+3)*3 = 12 square cm
30. It's the Base Area times the height.
3
It is: 3*4 = 12 square feet
Area = 0.538 = 12 square inches
12 square cm
The answer will depend on which of the three measures is the height. Ignore that one and multiply the other two to get the base area.
The formula for the area (A) of a triangle is A = 1/2 base x altitude (or vertical height). 18 = 1/2 x base x 12 : base = 2 x 18 ÷ 12 = 3 : The base is 3 in long.
18 square inches is probably the area of the triangle, not the length of the base. The length of the base would be measured in inches (a unit of length), not square inches (a unit of area). So area = 1 / 2 * base * height = 18 square inches (given) height = 4 * base (given) 1 / 2 * base * 4 * base = 18 square inches 2 * base * base = 18 square inches base * base = 9 square inches base = 3 inches height = 4 * base = 4 * 3 inches = 12 inches Checking our work: height is 4 times the base (12 = 4 * 3) area is 18 (1/2 * 12 * 3).