Please complete warm up and write down the Homework 

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Presentation transcript:

Please complete warm up and write down the Homework  Tuesday, February 21st Please complete warm up and write down the Homework  Warm Up Solve the Proportion 2. Find the Surface Area 5 in. 4 in. 3 in.

What candy is never on time? Choco-late Joke of the Day What candy is never on time? Choco-late

Interims are only 2 weeks away!!!!!!!!!! Weekly Review Answers Interims are only 2 weeks away!!!!!!!!!!

Volume and Surface Area Goal for today Volume and Surface Area Triangular AND Rectangular PRISMS

Surface Area

How would you describe: Net Volume And Surface Area

Using a Net Using a Formula Part 1: Surface Area Using a Net Using a Formula

Nets Find the area to each shape in the net. Add the areas up to find the TOTAL AREA Draw a net to help you see each face of the prism. Use the formula A = lw to find the area of each face.

Finding the Areas of each! A: A = 5  2 = 10 B: A = 12  5 = 60 C: A = 12  2 = 24 D: A = 12  5 = 60 E: A = 12  2 = 24 F: A = 5  2 = 10 Add the areas of each face. S = 10 + 60 + 24 + 60 + 24 + 10 = 188 The surface area is 188 in2.

You Try #1 Rectangle

Remember! Area of a TRIANGLE is ½ x b x h

You Try #2 Triangular Prism 12 in 5 in 4 in

You Try #3 Triangular Prism 3 in 7 in 11 in

Surface Area with Formulas

#1 Try Together! SA= 2(lw)+2(wh)+2(lh) SA=_____________+_____________+___________ SA=_________

#2 You Try! SA= 2(lw)+2(wh)+2(lh) SA=_____________+_____________+___________ SA=_________

Part 2: Volume

To find the volume of any prism, you can use the formula V= Bh,where B is the area of the base, and h is the prism’s height. The base of a RECTANGULAR prism is a rectangle so the base is: l x w To find the volume of a triangular prism, B is the area of the triangular base so the base is: ½ x b x h

#1 You Try! A=bh B= l x w 16 in. 12 in. 29 in. V = lwh Write the formula. V = 29 • 12 • 16 l = 29; w = 12; h = 16 V = 5,568 in3 Multiply.

A rectangular prism with base length 6 ft, width 5 ft, and height 7 ft #2 You Try! A=bh B= l x w A rectangular prism with base length 6 ft, width 5 ft, and height 7 ft

#3 Try Together! A=bh B= ½ x b x h V = Bh Write the formula. 1 2 __ B = • 3.9 • 1.3; h = 4. 1 2 __ V = 10.14 m3 Multiply.

The bases of a prism are always two congruent, parallel polygons. Caution!

#4 You Try A=bh B= ½ x b x h V = Bh Write the formula. 1 2 __ B = • 6.5 • 7; h = 6. 1 2 __ V = 136.5 ft 3 Multiply.

#5 You Try A=bh B= ½ x b x h 9 ft 5 ft 4.5 ft V = Bh Write the formula. V = ( • 4.5 • 9) • 5 1 2 __ B = • 4.5 • 9; h = 5. 1 2 __ V = 101.25 ft3 Multiply.