The mean mark is 70% there are 30 students 20 of which are boys with a mean mark if 62% what is the mean for girls
1 answer:
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Answer:
Step-by-step explanation:
we have a square and a triangle
we want to figure out the area and the perimeter of the pentagon
to figure out the area of the pentagon we can use the given formula:
let's figure out :
since the given shape is a square Every angle of its 90° Thus the triangle is a right angle triangle
therefore the height is 4
substitute h and b
reduce fraction:
simplify multiplication:
likewise square
substitute s:
simplify square
hence,
to figure out perimeter
let's figure out hypotenuse first
therefore,
