2 years ago

The perimeter of a triangle is 90 cm.

Mathematics

2 answers:

harkovskaia [24]2 years ago

4 0

Can you work out what one share is
If you don’t know comment

salantis [7]2 years ago

3 0

Let's call one ratio = x

So, the sides are 3x, 5x and 7x respectively.

Since the perimeter is 90 cm, the sum of 3 sides = 90 cm

-> 3x + 5x + 7x = 90 cm

-> 15x = 90cm
-> x = 6cm.

So, the 3 sides are 3x6, 5x6 and 7x6 -> 18,30 and 42.

Recheck : 18 + 30 + 42 = 90

18:30:42 = 3:5:7 (all divided by 6)

You might be interested in

PLEASE HELP ASAP!!!!!!!!!!!

matrenka [14]

C. 1/3 of about hour or 20 Min

7 0

3 years ago

What is 4 and 1/4 -1 and 3/4

Sergio039 [100]

Answer:

youre answer is:

2.5

hope this helps

Brainliest plz :)

8 0

3 years ago

What is a21 of the arithmetic sequence for which a7=−19 and a10=−28? A. -35 B. 35 C. -58 D. -61

shepuryov [24]

Answer:

a21 = -61

Step-by-step explanation:

$a_{n}=a_{1}+(n-1)d$

$-19=a_{1}+(7-1)d$

$-28=a_{1}+(10-1)d$ (subtract to eliminate a₁)

9 = -3d

d = -3

-19 = a₁ + (6)(-3)

-1 = a

a21 = -1 + (21 - 1)(-3)

= -61

8 0

2 years ago

Read 2 more answers

Prove that (a-b) x (a+b)=2a x b is true.<br> (a and b are vectors)

Anon25 [30]

(a-b) X (a+b)
= aXa - bXa +aXb -bXb (distributing)

Now, cross product of a vector with itself = 0
so, aXa = 0, bXb = 0

Also, aXb = - bXa

so,
(a-b) X (a+b) = 0 + aXb + aXb + 0
= 2aXb

hence, proved :)

6 0

3 years ago

Read 2 more answers

Pls, HELP IF U DONT KNOW THE ANSWER THEN DONT RESPOND, I WILL GIVE BRAINLESS IF CORRECT.

LenKa [72]

Answer:

The answer is 0.23

Step-by-step explanation:

Hope this helps.

Pls tell me if Im not correct.

4 0

3 years ago

Read 2 more answers