Math 1.2

OA,OB,OC are there mutually perpendicular straight lines in space. If A=a, OB=b, and OC=c, then the volume of the pyramid OABC is kabc÷0​. Find the value of k?

• ½

• 2

• ½abc

• 6

• ¼

An equilateral triangle and a regular hexagon have the same perimeter. If the area of the hexagon is 72√3​, calculate the area of the triangle.

• 62.354

• 83.138

• 101.823

• 103.923

• 124.708

What happens if h>0

• Shifts left

• Shrinks over x-axis

• Shifts up

• Shifts down

• Shifts right

When the quadratic function streches?

• -x²

• x²-k

• a>1

• x²+k

• 0<a<1

• A

• B

• C

• D

• E

• A

• B

• C

• D

• E

In Figure 1, the lateral area of the right circular cone is 60π. If the radius of the base is 6, calculate the volume of the cone.

• 96π

• 108π

• 120π

• 184π

• 60π

If circle R, of area 4 square inches, radius of circle S is twice of circle R, then the area of circle S, in square inches, is ...

• 8

• 8√2

• 16√2

• 12

• 16