Help please. Find A if possible
2 answers:
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The pyramid is shown in the diagram below.
The pyramid is built from four congruent triangles and one square as the base
We have the side of the square, so the area is = 10×10 = 100
We need the height of the triangle to work out its area. We can find out by using the height of the pyramid and half of the length of the side of the square.
Using the Pythagoras rule
Height of triangle =
Area of one triangle = 1/2×10×12=60
Surface area of the pyramid = 100 + (4×60) = 340 square inches
The pyramid is built from four congruent triangles and one square as the base
We have the side of the square, so the area is = 10×10 = 100
We need the height of the triangle to work out its area. We can find out by using the height of the pyramid and half of the length of the side of the square.
Using the Pythagoras rule
Height of triangle =
Area of one triangle = 1/2×10×12=60
Surface area of the pyramid = 100 + (4×60) = 340 square inches
<em>Formula:</em>
<em>Plug in the values:</em>
<em>Simplify LHS:</em>
<em>Multiply by 1936 on both sides:</em>
<em>Simplify RHS:</em>
<em>Square root both sides:</em>
Answer: The radius is 4 units. (Answer B)
<em>Plug in the values:</em>
<em>Simplify LHS:</em>
<em>Multiply by 1936 on both sides:</em>
<em>Simplify RHS:</em>
<em>Square root both sides:</em>
Answer: The radius is 4 units. (Answer B)