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3 years ago

What’s the surface area of a triangular pyramid

1 answer:

Nutka1998 [239]3 years ago

8 0

To find the surface area of a regular triangular pyramid, we use the formula SA = A + (3/2)bh, where A = the area of the pyramid's base, b = the base of one of the faces, and h = height of one of the faces.

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Please help me!

marusya05 [52]

Answer:

Step-by-step explanation:

Nice summary problem.

<AEC

AEC = 360 - 243.5 = 116.5
The number of degrees in 1 rotation of a circle = 360o. You have accounted for 243.5 degrees. What is left over is the answer.

<EAD and <ECD

Both of these are tangents to a circle. Tangents meet radii at 90 degree angles.

<EAD = <ECD = 90 degrees

<ABC

<ABC is 1/2 the central angle. The Central angle is <AEC

< AEC = 116.5
<ABC = 1/2 * 116.5
<ABC = 58.25

<ADC

There are 2 ways of doing this. You should know both of them.

One

All quadrilaterals = 360 degrees. You know three of the angles. You should be able to find ADC

<ADC + 90 + 90 + 116.5 = 360 Add the four angles together.
<ADC + 296.5 = 360 Combine terms on the left
<ADC = 360 - 296.5 Subtract 238.25 from both sides
<ADC = 63.5 Answer

Method Two

<ADC = 1/2 (major Arc - Minor Arc) This formula is fundamental to circle / tangent properties. The Major arc is the larger of the two parts of the circumference of a circle. The Minor arc is the smaller.

<ADC = 1/2(243.5 - 116.5)
<ADC = 1/2(127)
<ADC = 63.5

8 0

3 years ago

HELP PLEASE

nasty-shy [4]

Answer:

Part A: -2.5

Part B: -1

Part C: 1

Part D: 2.5

5 0

3 years ago

What is the slope of a ramp that rises 6 inches for every horizontal

san4es73 [151]

Rise/run, so 6/12=1/2

6 0

3 years ago

Find two numbers whose product is -2, and whose sum is -1.

PIT_PIT [208]

Answer:

$x=-2 \ \ \ and \ \ \ y=1$

Step-by-step explanation:

Suppose numbers are x and y

Product of x and y is -2

$xy=-2$

And sum of x and y is -1

$x+y=-1$

$x=-2 \ \ \ and \ \ \ y=1$

8 0

2 years ago

Without graphing, tell whether the point (10, 37) is on the graph of y = 3x + 7.

slava [35]

Answer: YES

Plug in the numbers in your head.

y=3(10)+7

y=30+7

y=37 which is the y intercept

7 0

3 years ago