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3 years ago

A triangle has angles measuring 15° and 45°. What is the measurement of the triangle’s third angle?

2 answers:

6 0

First you need to know that the internal angles of a triangle always equals 180°. Therefore:

15+45= 90°

Then since the angles should equal 180, you do:

180-90=90

So the missing angle equals 90°

lara31 [8.8K]3 years ago

6 0

Answer:

120 degrees

Step-by-step explanation:

180-15-45=120

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bagirrra123 [75]

Answer:

x ≈ 3.1 ft

Step-by-step explanation:

The segment from the centre to the chord is a perpendicular bisector, thus

The triangle is right with base = $\frac{1}{2}$ x

Applying Pythagoras' identity to the right triangle, then

( $\frac{1}{2}$ x )² + 1.4² = 2.1²

$\frac{1}{4}$ x² + 1.96 = 4.41 ( subtract 1.96 from both sides )

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x² = 9.8 ( take the square root of both sides )

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3 years ago

13. What is the surface area of the rectangular solid below using its net?

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Answer:

108 square units

<h3>Step-by-step explanation:</h3>

3 x 4 = 12

6 x 3 = 18

6 x 4 = 24

24(2) + 18(2) + 12(2) = 108 square units

Therefore, the surface area of the rectangular solid below using its net is 108 square units

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Step-by-step explanation:

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Nookie1986 [14]

Answer:

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Step-by-step explanation:

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