Group competition The faster group is the winner

Group Group competitioncompetition

The faster group is the winner.

The The groupsgroups

Group1: Katherine, Alex.Z, JackGroup2:, Chris, Claudia, Lewis, MaxGroup3: Caroline, Allen, Jerry, LisaGroup4: Lois, Karl, Robert, AntonyGroup5: Catherine, Angel, Emily, VincentGroup6: Angela, Tiffany, Eric, KrystalGroup7:Nicole,Javi, Penny , Alex.T

VS.VS.

Groups orderGroups order

Find the volume of the figure

Answer key

Group2 VS. Group3Group2 VS. Group3

126ft3

The figure is a general right prism.We should use the formula ：

Volume=area of base × heightBase area= 6 triangles’

area=1/2×4×3.5×6=42ft2

V= base area × h=42×3=126ft3

Find the volume

Answer key

Group4 VS. Group5Group4 VS. Group5

solutionThe figure equals half of a

rectangular prism, we can use the formula: v=1/2(base area ） ×h

Base area= 3×3ft2, h=4ftV= (9×4)/2=18ft3

Find the volume Answer key

Group6 VS. Group7Group6 VS. Group7

solutionWe should use the formula: v=

base area×hV=

πr2×h=5×5×3.14×4=314inches3

Answer key

Group2 VS. Group3Group2 VS. Group3

solution Hexagonal: having six sides Apothem: the perpendicular line or

distance from the centre of a regular polygon to any of its sides

Base area=6 triangles’ areas=(6×5×4.3)/2=64.5yd2

H=5yd V=base area × h=64.5×5=322.5yd3

6 vs ?

Answer key

Group? VS. Group?Group? VS. Group?

solutionTrapezoidal: resembling a trapezoidTrapezoid: a flat shape with four straight

sides, one pair of opposite sides being parallel and the other pair not parallel

Base area= the trapezoid’s area=(3+5) ×1.7 ×(1/2)=6.8km2

H=6kmV=base area × h=6.8 × 6=40.8km3

Determine the surface area of each Determine the surface area of each composite object to the nearest tenth composite object to the nearest tenth of a square centimeter where necessary of a square centimeter where necessary

Answer key

Group? VS. Group?Group? VS. Group?

solution surface area （ cylinder ） =6π*20+2π3*3 Surface area （ small Rectangular ） =

2*10*15+3*10*2+15*3*2 Surface area （ big Rectangular ） =7*35*4+35

*35 Answer ： 3880+102π

What have you learned in this class? The winner group which answers more

important answer.

Final roundFinal round