How to measure the degree of angle ABC

How to measure the degree of angle ABC

If the sum of internal angles of a Pentagon is 540 degrees, then the degree of each angle is 540 / 5 = 108 degrees
If the sum of the inner angles of a Pentagon is 540 degrees, the number of degrees of each angle is 540 / 5 = 108 degrees
According to the external angle of 180 '
Measure the outside angle of ABC
Subtract the measured external angle from 180
In the angle ABC, it is known that ∠ B - a = 15 & ordm;, ∠ C - B = 60 & ordm;, and the degree of ∠ C is calculated
Angle B-angle a = 15 degrees, angle c-angle B = 60 degrees, angle a + angle B + angle c = 180 degrees. By solving the equations, angle c = 105 degrees
∠B-∠A=15º.........................①
∠C-∠B=60º.........................②
∵∠A+∠B+∠C=180º...........③
∴④+①-② ∠B=45º
Substituting into ②, we get ∠ C = 105 & # 186;
Dissolve 50 grams of sugar in 200 grams of water and turn it into sugar water. What's the proportion of sugar in sugar water? What's the proportion of water in sugar? What's the proportion of sugar in water? How many times of water
Sugar accounts for 50% of the sugar water (200 + 50) = 1 / 5 = 20%
Water accounts for 1-20% of sugar water = 80%
Sugar is 50 / 200 of water = 1 / 4 = 25%
Water is four times as much as sugar
The proportion of sugar in syrup: 50 * (200 + 50) = 1 / 5
The proportion of water in sugar is 1 / 4
Sugar is a fraction of water: 50 * 200 = 1 / 4, water is four times of sugar
Sugar accounts for one fifth of sugar water, water accounts for four percent of sugar, sugar is one fourth of water? Water is four times as much as sugar
What are sin 35 ° and COS 35 ° respectively?
Can't the computer come out as soon as it's pressed
sin35°=0.5735764...
cos35°=0.819152...
If you want to calculate directly without a calculator, you can expand it with Fourier series, and then calculate the exact value one by one. This is too deep to be clear here
Add 30 grams of sugar to 100 grams of water, then what is the proportion of water in sugar water?
Sugar water 30 + 100 = 130 (g), the proportion of water in sugar water: 100 △ 130 = 1013