A candy bar box is in the shape of a triangular prism. The volume of the box is 2,400 cubic centimeters.

 A) 15 cm

 B) 1240 cm²

Step-by-step explanation:

Part A: The height of the triangular base can be found a couple of ways. One is to use the Pythagorean theorem.

The triangular base is isosceles, so the height, half its base (8 cm) and the long edge (17 cm) form a right triangle. The height is then found from ...

 17² = 8² + height²

 289 -64 = height² . . . . . subtract 64

 √225 = 15 = height . . . . take the square root

The height of the triangular base is 15 cm.

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Part B: The volume of a prism is given by ...

 V = Bh

where B is the area of the base and h is the length ("heigh") of the prism. We can use this formula to find B, the area of each of the triangular bases of the prism.

 2400 cm³ = B·(20 cm)

 2400 cm³/(20 cm) = B = 120 cm² . . . . . area of one end of the prism

Now the lateral area of the prism is the product of its length (20 cm) and the perimeter of its base (17 cm + 17 cm + 16 cm). That area is ...

 lateral area = (20 cm)(50 cm) = 1000 cm²

Together with the areas of the two ends, we find the total area of the cardboard box to be ...

 total area = lateral area + 2×base area = 1000 cm² + 2×120 cm²

 total area = 1240 cm²

Note that you can also find the height of the base triangle from the base area.

 A = (1/2)bh

 120 cm² = (1/2)(16 cm)h

 120 cm²/(8 cm) = h = 15 cm

step-by-step explanation:

this is not possible to solve with the info given.   you need at least an one angle somewhere.