1. Mathematics - Q&A

piesoup: Thank you Dimky!

Jackie: Y2-y1/x2-x1

tsukiyo92: for simple formula, (y2-y1)/(x2-x1) Example above: (3-1)/(9-3) = 2/6 = 1/3 as gradient/slope

tsukiyo92: When multiple 'individual' log is add/subtract, they can be convert into single log with multiplication/division. Above example: Log 9 - Log 3 (2 individual log) Convert: Log (9 / 3) [minus->divide, plus->multiply] = Log (3)

tsukiyo92: When multiple 'individual' log is add/subtract, they can be convert into single log with multiplication/division. Above example: Log 9 - Log 3 + Log 4 (3 individual log) Convert: Log (9 / 3 * 4) [minus->divide, plus->multiply] = Log (3 * 4) = Log 12

tsukiyo92: Definition: Right angle = 90 degrees Acute Ange < 90 degrees (less than 90 degrees ) Obtuse Angle >90 degrees <180 degrees We need to consider all type of triangle (2D0, total 180 degrees )common: Right Angle Triangle= one 90 degrees , 2 other sum up to 90 degrees Equilateral Triangle= all three corner 60 degrees Since equilateral triangle have no 90 degrees , neither exactly 2 acute angle, so second option is the answer. (which hold true to all type of 2D triangle) Triangle do ATLEAST have 2 acute angle, just draw alot different triangle to figure out yourself. Or mathematical method: (alot of thought, may be confusing) Triangle have 3 corners with total of 180 degrees . Few possibiliy: If you have 1 right angle: 180-90=90 degrees left, so there must be 2 acute angle. If you have 1 obtuse angle,eg.: 180-160=20 degrees , remain 2 angle are acute angle also. If there is no obtuse nor right angle, then remain is 3 acute angle.

PART66Online: You just need to remember sin cos table for angle values like 0, 30, 45, 90

satishpandey: total circumference of the earth = 2 pie r arc length we need is with an angle of 90-23=67 degrees so the arc distance is (67/360) * 2 pie R = 1.17R

Max_Bellamy: Okay. Thanks. I need to calculate carefully next time

Farman Mughal: curve with two turning points.

Macaw1986: thank you for the clarification.

PART66Online: That is more correct. :)

PART66Online: Simple math. First you do actions in brackets. After that devision and multiplication. After that addition and subtraction. And as result answer is 29.9

trap2307: It was mistake in the question. Now it is corrected. Thank you.

trap2307: The default base is 10. log100=2, because 10^2=100 properties of logarithms... 2+2=4 ;)

PART66Online: Hello. Maybe you didn't read question correctly. In this case answer is "Rationalizing the denominator". Check this link: purplemath.com/modules/radicals5.htm Squaring not correct in this case.

PART66Online: Formula for calculating area of sector is S = (A/360) * pi *r^2, so if angle A will increase, area also will increase proportionally.

trap2307: 1 litre = 1000 cm^3 , 4000 litres = 4,000,000 cm^3 , Volume of water is 4m x 2m x depth, Change to cm 400 * 200 * depth = 4,000,000, Therefore, depth = 4,000,000/(400*200) = 400/8 = 50 cm.

Danish Abeer: thank you

Thai Minh Hoang: Better is: 4*5 - 2*(1*3)=14

Indrajith: Total area =196 square inches in square cm=196(2.54*2.54) where 1"= 2.54cm =1264.5136 square cm

jawwadbaig: i got it. thanks. i was making a silly mistake.

PART66Online: Hello. New torque reading = desired torque x L/(x + L). 50 x 8/10 = 40 lb.ins

PART66Online: 900 / 1.2 = 750 1.2 because now you have 120% of pre-profit balance.