3 years ago

What is an addition equation for 20-(-10)?

Mathematics

1 answer:

noname [10]3 years ago

5 0

Answer:

20+10

Step-by-step explanation:

You are subtracting a negative so it becomes like that.

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Calculate the perimeter of segment in r= 21cm, a=135

Svetllana [295]

Step-by-step explanation:

r=21cm

a=135

perimeter=2r+ar

=2×21+135×21

=42+2835

=2877cm

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3 years ago

A 30-60-90 triangle’s shortest side has a measurement of x. What is the measurement of the other side that includes the right an

Stella [2.4K]

In a 30 60 90 triangle, the "middle-sized" side = the short side multiplied by the square root of 3.
so the "middle-sized" side = x * square root of 3.

Source:
http://www.1728.org/trig2.htm

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3 years ago

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balandron [24]

The answer to the question is a

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3 years ago

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4 years ago

Right triangles abc and bcd with right angle c are given below. if m(a)=30∘,m(d)=45∘, and bd=12, find the length of ab. note: th

vesna_86 [32]

Solution:

A is the right tringle ABD, C is bisects AD.

AC = CD and BD = 12

BC=BDsin(BDC)

BC=12Sin(45)

$=12\times \frac{1}{\sqrt{2}}=\frac{12}{\sqrt{2}}$

$AB=\frac{BC}{sin(bac)}=\frac{\left | 2 \right |\sqrt{2}}{sin30}=\frac{\left | 2 \right |\sqrt{2}}{\frac{1}{2}}=\frac{12\times 2}{\sqrt{2}}$

$AB=\frac{24}{\sqrt{2}}=12\sqrt{2}$

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3 years ago