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**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.

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**What candy is never on time? Choco-late**

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

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**Interims are only 2 weeks away!!!!!!!!!!**

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

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**Volume and Surface Area**

Goal for today Volume and Surface Area Triangular AND Rectangular PRISMS

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Surface Area

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**How would you describe:**

Net Volume And Surface Area

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**Using a Net Using a Formula**

Part 1: Surface Area Using a Net Using a Formula

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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.

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**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 = = 188 The surface area is 188 in2.

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You Try #1 Rectangle

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

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**You Try #2 Triangular Prism**

12 in 5 in 4 in

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**You Try #3 Triangular Prism**

3 in 7 in 11 in

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**Surface Area with Formulas**

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**#1 Try Together! SA= 2(lw)+2(wh)+2(lh) **

SA=_____________+_____________+___________ SA=_________

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**#2 You Try! SA= 2(lw)+2(wh)+2(lh) **

SA=_____________+_____________+___________ SA=_________

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Part 2: Volume

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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

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**#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.

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**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

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**#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 = m3 Multiply.

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

Caution!

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**#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 = ft 3 Multiply.

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**#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 = ft3 Multiply.

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