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Lelechka [254]
3 years ago
9

If DE ⊥ EF, then ∠DEF is a right angle, provide a counter example if false... help??

Mathematics
1 answer:
svp [43]3 years ago
6 0

Answer: true

Step-by-step explanation:

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Dima020 [189]
We need the number that belongs just before "of" .
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4 years ago
7. A triangle has sides with lengths of 10 metres,
Kay [80]

Answer:

It is not a right triangle.

Step-by-step explanation:

We can prove this by Pythagorean theorem because it represents to a right triangle.

Pythagorean theorem:

a² + b² = c²

Now substitute the values.

Note: the longest side will represent c

So,

a = 10 m

b = 16 m

c = 20 m

10² + 16² = 20²

The objective here is to make them equal.

100 + 256 = 400

356 ≠ 400

They are not equal so it is not considered a right triangle.

7 0
3 years ago
Find the value of x in the triangle shown below
olga nikolaevna [1]

Answer:

102

Step-by-step explanation:

it is an isosceles triangle as two sides are equal i.e 3.3 so angles opposite to equal sides are also equal so 39 plus 39 plus x = 180°

78 plus x =180

x=180-78

x=102°

hope it helps

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3 years ago
15 POINTS PLEASE HELP
Anika [276]
4. x^10

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3 years ago
I need help again please 5/6-1/6
Murljashka [212]
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