Question

4. The Grade 6 pupils are constructing a square pyramid for their project. They plan to
cover it with Manila paper. If one side of the base measures 2.2 meter and the height of its
triangular face is 1.9 m, what size of manila paper will be needed to cover all faces of the pyramid?
A. 13.20 sq m
B. 12.30 sqm
C. 12.03 sqm
D. 10.30 sqm

5. Marie wants to cover a rectangular box entirely with wall paper. How many square
centimetres of wall paper will he need if the box measures 15 cm long, 10 cm wide, and 8
cm deep?

A. 1500 sq cm
B. 1200 sq cm
C. 900 sq cm
D. 700 sq cm​

Answer 1

Answer:

4.

Solution given:

length of base[a]=2.2m

slant height [l]=1.9m

Total surface area=?

we have

Total surface area of a square pyramid :

area of base+ curved surface area

:a²+2al

:2.2²+2*2.2*1.9

:13.20 m²

SoA. 13.20 sq m is a required answer.

5.

Solution given:

length [l]=15cm

wide [w]=10cm

height[h]=8cm

total surface area of cuboid =?

we have

total surface area of cuboid =sum of area of all side.

=2[lw+lh+wh]

=2[15×10+15×8+10×8]

=700cm²

D. 700 sq cm is a right answer.