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Alika [10]
3 years ago
12

Surface area of the 3D shape figure cm2

Mathematics
1 answer:
monitta3 years ago
3 0

Answer:

152 squared cm

Step-by-step explanation:

You divide the figure into 2 shapes. A triangular pyramid, and a rectangular prism. Find the surface are of each, and add them together.

Triangular pyramid

1. Find surface area of one triangle and multiply by 4, since there are four of the congruent triangles.

5(height) times 4(base of triangle) divided by 2

You get 10, then multiply 10 by 4, because there are 4 congruent triangles.

Figure 1 = 40 cm2

Rectangular Prism

4 times 4 = 16 (base surface area)

6 times 4 = 24 (area of one side)

24 times 4 = 96 (surface area of all 4 sides)

96(surface area of all 4 sides) + 16(surface area of base) = 112

40(surface area of pyramid) + 112(surface area of prism) = 152 cm2

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A robot’s height is 1 meter 20 centimeters. How tall is the robot in millimeters?
Flura [38]

Answer:

A

Step-by-step explanation:

There are 1000 mm in one meter

and there are 10 mm in one cm

so

1000 + 20(10) = 1200mm

Therefore the answer is 1200mm

8 0
2 years ago
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Use the multiplier method to increase £258 by 43%<br>You must show your working.​
raketka [301]

Hello there, to answer your question...

258, percentage increased by 43% (percent) of its value

<h2> = 368.94</h2>

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I hope this information helps.

8 0
3 years ago
2 1⁄7 × 3 3⁄4 × 5 1⁄3 = <br> plz help me :,(
chubhunter [2.5K]

Answer:

42 6/7

Step-by-step explanation:

For me what i usually do is i convert the mixed number into a fraction, which for example:

Example and Explanation: Step 1

so since the number 7 is the denominator and the 2 is the mixed number, we can multiply these numbers, 2 x 7 = 14, then we add our numerator which in this case, is one, 14 + 1 = 15, and since the denominator stays the same, our fraction now is 15/7. We do the same for the others:

3 3/4:

3 x 4 = 12 + 3 = 15 = 15/4

5 1/3:

5 x 3 = 15 + 1 = 16 = 16/3

Now that they are all fractions we can finally do the multiplication

Multiplying Fractions: Step 2

Multiplying fractions does not require that the fractions have the same denominator. Instead, the numerators are multiplied with each other and the denominators are multiplied with each other. However, the resulting fraction may not be in lowest terms so it may need to be reduced. So since this is a three step multiplication problem, we will multiply two fractions first.

In this case I chose 15/7 x 15/4. so we just multiply from there, 15 x 15 = 225, and  7 x 4 = 28. So our fraction is 225/28, now we will multiply the other fraction: 225/28 x 16/3 which comes out to 3,600/84. Wow, thats a big number, now its time to..

Reduce: Step 3

This fraction is far too big to be a proper answer, so we will reduce, also known as simplifying.  

Find the Greatest Common Factor (GCF) of 3600 and 84, if it exists, and reduce our fraction by dividing both numerator and denominator by it. GCF = 12,

=3600÷1284÷12=3007

Converting to a mixed number using long division with remainders for 300 ÷ 7.

300÷7=42r6

Therefore:

300/7 = 42 6/7

I am so sorry if i am wrong

3 0
3 years ago
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lesya692 [45]
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otez555 [7]

Answer:

25-7-r

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