Sylvia Said:

Can someone fill in the blanks to this surface area grade 8 math worksheet?

We Answered:

You fixed the link!!!!! <3

ok... so...
"How many different-sized rectangles are there?"
i'd say 2 even though there are 3 rectangles, they only are in 2 sizes "big/small"

area: the small rectangle:
A = L X W
A = 7 X __ <---- the width is 2, given in the diagramm
A = 7 X 2
A = 14

area: the big rectangle:
A = L X W
A = 9.9 X __ <---- the width is 2, given in the diagramm
A = 9.9 X 2
A = 19.8

How many triangles of the same size are there?
2 <---- top and bottom if u lay prism flat.

area: the triangle:
A = (b × h) ÷ 2
A = (7 X 7) ÷ 2
A = 49 ÷ 2
A = 24.5

Surface Area
(2 × area of small rectangles) + (area of large rectangle) + (2 × area of triangle)
(2 × 14) .............................. + (19.8) ......................... + (2 × 24.5)
28 + 19.8 + 49
=96.8cm²

Mario Said:

Grade 8 math worksheets?

We Answered:

Im in year 8 and i had a maths exam
And im stupid i only got 4!
i wish i studied.
i think you should just google it
or read through your work books