How many diagonals does a polygon with 36 sides have ?
How many diagonals does 11-sided convex polygon have?
Mỗi điểm nối với 8 điểm còn lại
Có 11 điểm = 11 . 8 = 88 (đường chéo)
Nhưng như vậy mỗi đường chéo được tính 2 lần.
Vậy có : 88 : 2 = 44 đường chéo
Công thức : a . (a - 3) : 2
a là số cạnh (hoặc điểm)
Dịch: Đa giác lồi - 11 cạnh có bao nhiêu đường chéo ?
Đa giác 11 cạnh => có 11 đỉnh
Với mỗi đỉnh của đa giác nối với 10 đỉnh còn lại ta được 10 đoạn thẳng
Có 11 đỉnh ta vẽ được là 11.10 = 110 đoạn thẳng
Trong đó, mỗi đoạn đều được tính 2 lần nên số đoạn thẳng có là: 110 : 2 = 55 đoạn
55 đoạn này có 11 đoạn là cạnh của đa giác nên số đường chéo của đa giác có là: 55 - 11 = 44 đường chéo
ĐS:...
How many sides does a decagon have?
How many sides does a decagon have?
Mn giải và dịch dùm bài này cái :
If the sum of al interior angles in a convex polygon is 1080 degrees, then this polygon has ........... diagonals.
tks mn
em chả hiểu gì cả, nhung đề bài đây
nếu tổng của tất cả các góc trong 1 đa giác lồi là 1080 độ . vậy đa giác có bao nhiêu đường chéo??????????
4 points A,B,C and D are consecutive vertices of a regular polygon with 20 sides. Find the measure of ACD
trả lời câu hỏi sau
1 how many rooms does your house have?
2 how many pens do you have ?
3 how many brothers do you have ?
4 how many floors does your school have ?
5 what time does your brother go to school ?
6 what time do you get up ?
7 what time does your sister wash her face ?
8 what time do you brush your teeth ?
9 what do you do at 6.45 ?
10 what does your father do at 6.30 ?
1 how many rooms does your house have?
2 how many pens do you have ?
3 how many brothers do you have ?
4 how many floors does your school have ?
5 what time does your brother go to school ?
6 what time do you get up ?
7 what time does your sister wash her face ?
8 what time do you brush your teeth ?
9 what do you do at 6.45 ?
10 what does your father do at 6.30 ?
There are 4 rooms in my house
I have 10 pens
I have 2 brothers
My school has 3 floors
He goes to school at 7a.m
I get up at 6a.m
She washes her face at 8a.m
I brush my teeth at 10p.m
I have breakfast at 6.45
He does morning exercise at 6.30
V. Make questions with “How many/ How much" for the underlined part in the following sentences.
36. I have only a little luggage. (gạch chân dưới chữ "only a little luggage")
_______________________________________________________________________________
37. I need some paper to write on. (gạch chân dưới chữ "some paper")
_______________________________________________________________________________
38. My father often reads two papers a day. (gạch chân dưới chữ "two paper")
_______________________________________________________________________________
39. I usually drink two litres of water every day.( gạch chân dưới chữ "two litres of water")
____________________________________________________________________________
40. I need some bread to make sandwiches. (gạch chân dưới chữ "some bread")
______________________________________________________________________________
36. I have only a little luggage.
____How many luggages do you have ?_______________________________
37. I need some paper to write on.
___How much paper do you need to write on ?_________________________________
38. My father often reads two papers a day.
______How many papers does your father often read ?_____________________
39. I usually drink two litres of water every day.
___________How much water do you usually drink every day ?_______________
40. I need some bread to make sandwiches.
___________How much bread do you need to make sandwiches ?_____________
Identify the mistake in each sentence
1. How many childs does your mother have?
A B C D
2. Vy is really excited with her first day at school.
A B C D
3. We have geography every Wednesdays.
A B C D
4. If you climb the mountain, you will sees a lot of flowers.
A B C D
5. There are five bridge across Han River in Da Nang.
A B C D
Identify the mistake in each sentence
1. How many childs->children does your mother have?
A B C D
2. Vy is really excited with->about her first day at school.
A B C D
3. We have geography every Wednesdays->Wednesday.
A B C D
4. If you climb the mountain, you will sees->see a lot of flowers.
A B C D
5. There are five bridge->bridges across Han River in Da Nang.
A B C D