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3 years ago

Triangle A is mapped onto triangle A’

Mathematics

1 answer:

Pavlova-9 [17]3 years ago

6 0

Answer:

What do you mean???

Step-by-step explanation:

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7cm<br> 9cm<br> 4cm<br> 4cm<br> Find the area

sladkih [1.3K]

Step-by-step explanation:

lenght =4+4+7cm

=15cm

breadth=9cm

Now,

Area(A)=L×B

=15cm×9cm

=135cm^2

7 0

3 years ago

Due in 2 days please help

Tresset [83]

Answer:

396cm

Step-by-step explanation:

first shape is 180

second shape is 216

6 0

3 years ago

In the diagram, AD=CD=CB and measure of angle A=40°. How many degrees are in angle DCB?

Ad libitum [116K]

Answer:

$20^{\circ}$

Step-by-step explanation:

Consider triangle ACD. This triangle is isosceles triangle, because AD = DC. Angles adjacent to the base AC are congruent abgles, so

$m\angle DAC=m\angle DCA=40^{\circ}$

The sum of the measures of all interiror angles in the triangle is always $180^{\circ},$ then

$m\angle DAC+m\angle DCA+m\angle ADC=180^{\circ}\\ \\40^{\circ}+40^{\circ}+m\angle ADC=180^{\circ}\\ \\m\angle ADC=180^{\circ}-40^{\circ}-40^{\circ}=100^{\circ}$

Angles ADC and BDC are supplementary angles (add up to $180^{\circ}$ ), then

$m\angle BDC=180^{\circ}-100^{\circ}=80^{\circ}$

Consider triangle BCD. This triangle is isosceles triangle because BC = DC. Angles adjacent to the base BD are congruent abgles, so

$m\angle BDC=m\angle DBC=80^{\circ}$

The sum of the measures of all interiror angles in the triangle is always $180^{\circ},$ then

$m\angle DBC+m\angle BDC+m\angle BCD=180^{\circ}\\ \\80^{\circ}+80^{\circ}+m\angle BCD=180^{\circ}\\ \\m\angle BCD=180^{\circ}-80^{\circ}-80^{\circ}=20^{\circ}$

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3 years ago

Find the derivative of f(x)=2arcsin(x-1)

andreev551 [17]

Since $\dfrac{\mathrm d}{\mathrm dx}\arcsin x=\dfrac1{\sqrt{1-x^2}$ , you have

$\displaystyle\frac{\mathrm d}{\mathrm dx}2\arcsin(x-1)=2\frac{\mathrm d}{\mathrm dx}\arcsin(x-1)=2\frac{\dfrac{\mathrm d}{\mathrm dx}(x-1)}{\sqrt{1-(x-1)^2}=\frac2{\sqrt{2x-x^2}}$

6 0

4 years ago

Which of the following is the solution set of -2|x| < -8

liraira [26]

-2|x|<-8

(-2|x|)/-2<-8/-2

|x|>4

x>4 or x>-4

Solution: ] -♾️ , -4 [ U ] 4 , + ♾️ [

PLEASE GIVE BRAINLIEST

6 0

2 years ago