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2 years ago

An equilateral triangle with side length 7 cm is shown in the diagram, work out the area of the triangle.

1 answer:

8 0

If a triangle has sides of 7 cm and it is an equilateral you can draw a line right down the middle to form two congruent triangles.

These smaller triangles have a hypotenuse of 7cm and a base of 3.5 cm (7/2)

To work out the height, use Pythagoras’ theorem.

a^2 + b^2 = c^2 where c is the hypotenuse and a and b are the other two sides

7^2 - 3.5^2 = 36.75

Square root answer

= 6.06 cm

That’s the height of the triangle

Area of a triangle is base x height divided by 2

So 7 x 6.06 = 42.43…

/2

= 21.2 cm^2 to one d.p

Hope this helped!
Please mark Brainliest!!

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Step-by-step explanation:

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1 year ago

The graph represents the data cost for monthly internet service for a cell phone. Which function, C(x), respresent the monthly c

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Answer:

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3 years ago

A bakery sells bagels at two different rates. When a customer buys fewer than 12 bagels, each one costs $1.25. When a customer b

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Answer:

1.25b when b < 12 , 1b & then 0.75 b when b > 12

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3 years ago

Are rectangle or garden has a length of 10.25 feet and a width of 6.2 feet. Another rectangle or garden has a length of 20.5 fee

Alinara [238K]

Hello!

The formula for finding area of a rectangle is length × width

1st garden
l = 10.25
w = 6.2

6.2 × 10.25 = 63.55

Area = 63.55 ft²

2nd garden

l = 20.5
w = 12.4

20.5 × 12.4 = 254.2

Area = 254.2 ft²

Divide the bigger area by the smaller area

254.2 ÷ 63.55 = 4

$\framebox {4 times greater}$

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3 years ago

a girl has to be at school at 8:00 am it takes her 20 minutes to eat, 35 minutes to get dressed and 15 minutes to get dressed wh

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2 years ago