Tracy made a stained glass jewellery box. It measured 20cm by 12cm by 8cm.
a) About how much glass did Tracy use?
b) one piece of glass has an area of 100 cm squared and costs $3.65. How much did the glass cost?(assume all pieces can be used
Please help don't understand this!!!
First find the surface area of this rectangular prism.
Surface Area of a Rectangular Prism = 2ab + 2bc + 2ac
http://www.math.com/tables/geometry/surfareas.htm
I don't get this, Can you help and solve the problem.
Sure! I can help you understand how to solve these problems.
a) To find out how much glass Tracy used, we need to calculate the surface area of the jewellery box. The surface area is the sum of the areas of all the sides of the box.
The jewellery box has six sides: 4 sides, 1 bottom, and 1 top.
Given the dimensions of the box:
Length = 20 cm
Width = 12 cm
Height = 8 cm
To find the surface area, we need to calculate the area of each side and sum them up.
Area of one side = Length x Width
Area of the bottom = Length x Width
Area of the top = Length x Width
Area of the four sides = 2 x (Length x Height) + 2 x (Width x Height)
Once you calculate the area of each side, add them all together to find the total area of the glass used.
b) To calculate the cost of the glass, we need to multiply the total area (found in part a) by the cost per square centimeter.
Given that one piece of glass has an area of 100 cm² and costs $3.65, we need to find out how many pieces of glass we used (total area divided by 100 cm²). Then we multiply the number of pieces by the cost per piece ($3.65) to get the total cost.
I hope this helps you understand how to solve these problems! Let me know if you have any further questions.