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Katyanochek1 [597]
3 years ago
13

Calculate the total surface area of the triangular pyramid.

Mathematics
1 answer:
AleksandrR [38]3 years ago
3 0

Answer:

45

Step-by-step explanation:

15+10= 25 + 20 = 45

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Find the x and y intercept and the slope of the graph of 8x-6y=24
andreev551 [17]

Answer:

the x intersept is 3 the y intercept is 4

Step-by-step explanation:

x intersept : 24/8 = 3

y intersept : 24/6 =4

4 0
2 years ago
In the isosceles △ABC m∠ACB=120° and AD is an altitude to leg BC . What is the distance from D to base AB , if CD=4cm?
snow_lady [41]

If ΔACB is an isosceles triangle, then ∠A ≅ ∠B and AC ≅ CB

Since ∠C = 120° and ∠A + ∠B + ∠C = 180°, then ∠A = 30° and ∠B = 30°

Next, look at ΔADB.  ∠A + ∠D + ∠B = 180°, so ∠A + 90° + 30° = 180° ⇒ ∠A = 30°

Now look at ΔADC.  Since ∠A = 30° in ΔACB, and ∠A = 60° in ΔADB, then ∠A = 30° in ΔADC <em>per angle addition postulate.</em>

Now that we have shown that ΔADB and ΔADC are 30-60-90 triangles, we can use that formula to calculate the side lengths.

CD = 4 cm (given) so AC = 2(4 cm) = 8 cm

Since AC ≅ BC, then BC = 8 cm. Therefore, BD = 4 + 8 = 12 <em>by segment addition postulate.</em>

Lastly, look at ΔBHD.  Since ∠B = 30° and ∠H = 90°, then ∠D = 60°. So, ΔBHD is also a 30-60-90 triangle.

BD = 12 cm, so HD = \frac{12}{2}cm = 6 cm

Answer: 6 cm



8 0
3 years ago
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Please help me 5-7g-3=
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Answer: −7g+2

If I Helped, Please Mark Me As Brainliest, Have A Great Day :D

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a rectangle has an area of 1/6 squar centimeters and a length of 1.5 centimeters what is the width and the perimeter
Alex73 [517]
<span>

(1/6)/ 1.5 = 
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3 0
3 years ago
Help me please and thank you
fiasKO [112]

Since the triangles are the same, just flipped that means that all angles and segments are the same as well

I'm not sure if that's the "correct" way to prove it but that's why they're equal

5 0
3 years ago
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