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Zarrin [17]
3 years ago
12

20 points help + brainlyist

Mathematics
1 answer:
allsm [11]3 years ago
8 0

Answer:

20 I know because I know

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Answer all questions
loris [4]

Answer:

7i) 140  7ii) 80  7iii) 60  8i) isosceles  8ii) 74  8iii) 60  8iv) 46 degrees  9i) 56  

9ii) 80  9iii) 62  10) Angle c is 64 degrees. Angle d is 26 degrees

Step-by-step explanation:

7i) Add up all the interior angles. Since the triangle is isosceles, there are two 70 degree angles. The exterior angle is equal to the two 70 degree angles together, or 140 degrees.

7ii) Add up all the interior angles. Since the triangle is isosceles, there are two 40 degree angles. The exterior angle is equal to the two 40 degree angles together, or 80 degrees.

7iii) Add up all the interior angles. Since the left triangle is isosceles, there are two 30 degree angles. The exterior angle is equal to the two 30 degrees angles together, or 60 degrees.

8i) This is an isosceles triangle because two of the sides are the same length.

8ii) Since the triangle is isosceles, there are two 74 degree angles, and angle BDC is one of them.

8iii) Since the triangle is equilateral, all of the angles equal 60 degrees. This means that angle DAB is 60 degrees.

8iv) Add together 60 degrees from the equilateral and 74 degrees from the isosceles triangle and subtract that sum from 180. 180 - (60 + 74) = 46 degrees.

9i) Angles x and 56 are consecutive interior angles, which means they are the same measure.

9ii) Since the triangle is isosceles, two of the angles are 50 degrees, so subtract 100 from 180 to find the other angle. 180 - 100 = 80 Angles 80 and x are alternate interior angles, which means they are the same measure.

9iii) Angle is has a measure of 62 degrees because the two triangles are the same except for the size, which doesn't matter.

10) Since the left triangle is isosceles, there are two 58 degree angles, so subtract the sum of the two angles from 180. 180 - 116 = 64 degrees  Looking at the triangle on the right, add together the 64 and 90 degree angles and subtract from 180 to find the measure of angle d. 180 - 154 = 26 degrees

If these answers are correct, please make me Brainliest!

5 0
3 years ago
Somebody help pls I need help with this
alisha [4.7K]

Answer:

Step-by-step explanation:140

7 0
3 years ago
Read 2 more answers
Need help with this slide about proofs explanation would be nice aswell.
Sunny_sXe [5.5K]

Answer:

1. AB ~= DF

2. Definition of Congruent

3. Reflexive Property of Congruency

4 BD=BD

6. AB+BD=AD; DF+BD=BF

7. Substitution Property of Equality

8. Definition of Congruent

Step-by-step explanation:

1. The given always goes first, and that's the first reason, so AB ~= DF must be the first statement (that should be the congruency symbol).

2. The definition of congruent is that if they are congruent then they are equal. Since that statement made two congruent lines equal, it must be the definition.

3. The reflexive property means something is congruent to itself, and BDis BD, therefore it is the reflexive property.

4. Remember if something is congruent then it is equal.

6. The segment addition postulate states that if we are given two points on a line segment, then AB+AC=AC.

7. In this statement AD was substituted for DF+BD. This can be done because of AB=DF and BD=BD as aforementioned.

8. If two things are congruent then they are equal by definition of congruency.

6 0
3 years ago
Two dice are rolled, find the probability that the sum is less than 13
Alex777 [14]
100% of the rolls would be less than 13. The highest number on one die is 6, so even if you roll 2 dice the sum of both dice will always be lower than 13.
It's a 1:1 probablility.
7 0
3 years ago
The dimensions of a triangular prism are shown.
Serhud [2]

9514 1404 393

Answer:

  B.  32 square inches

Step-by-step explanation:

Each of the two triangular faces has an area of ...

  A = (1/2)bh = (1//2)(6 in)(4 in) = 12 in²

The lateral surface area is the product of the prism height (0.5 in) and the perimeter of the base.

  LA = (0.5 in)(5 in +5 in + 6 in) = 8 in²

So, the total area is the area of the two base and the lateral area:

  SA = 2A +LA

  SA = 2(12 in²) +8 in² = 32 in²

The surface area of the prism is 32 square inches.

7 0
3 years ago
Read 2 more answers
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