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3 years ago

What is the area of DeltaSTR?

Mathematics

2 answers:

soldi70 [24.7K]3 years ago

6 0

Answer:

The correct option is A.

Step-by-step explanation:

The area of a triangle is

$A=\frac{1}{2}\times base\times height$

From the given figure it is clear that the base of the triangle STR is 6 ft and the height of the triangle 10 ft. So, the area of triangle STR is

$A=\frac{1}{2}\times 6\times 10$

$A=3\times 10$

$A=30$

The area of triangle STR is 30 square ft. Therefore the correct option is A.

TEA [102]3 years ago

3 0

Answer:

Step-by-step explanation:

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Answer:

-1/11

Step-by-step explanation:

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3 years ago

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baherus [9]

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Answer:

480 ft

Step-by-step explanation:

The geometry involves two similar triangles. The ruler at arms length forms a triangle that has the opposite side 3 inches high and 24 inches (2 ft) away. That is, the distance from the eye to the ruler is 8 times the height of the ruler.

The triangle involving the lighthouse is similar. That is, the angles in it are the same, so the sides are proportional to those in the smaller (ruler) triangle. The distance to the lighthouse will be 8 times the height of the lighthouse, just as the distance to the ruler is 8 times the height of the ruler.

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