Divide a rectangle with an area of 60 square centimeter into four different triangles. The area of the green triangle accounts for 15% of the area of the rectangle, the area of the yellow part is 28 square centimeter, and the area of the red part is 12 square centimeter. Calculate the area of the blue triangle

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• 1. A rectangle is divided into four different triangles, of which the area of the green triangle accounts for 15% of the rectangle, and the area of the yellow triangle is 21cm2 Area, main formula and method
• 2. In space quadrilateral ABCD, e, F, G and H are the midpoint of AB, BC, CD and Da respectively. If AC is perpendicular to BC, it is proved that efgh is a rectangle
• 3. In the space quadrilateral ABCD, e, F, G, h are the midpoint of AB, BC, CD, Da respectively. If AC ⊥ BD, efgh is what graph
• 4. 1. A "pz220-100" bulb, connected to a 200V circuit, the rated power of this bulb is______ W what is the actual power__________ W 2. An incandescent lamp is marked with the word "pz220-40". If the lamp is turned on for 4 hours every day, the power consumption will be 30 days per month____________ Kilowatt hour 3. 1 kwh of electricity can supply a 500W electric iron to work normally________ hour
• 5. If R1 and R2 are connected in series to the same power supply, the power of R2 is P2. Then P1: P2 =?
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• 7. How do physical units EV and j convert? RT
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• 9. How to calculate AC power I now have a voltage of 90a at 400 / 3 / 50. What is the power? This is AC, not DC How to calculate the single-phase 220 V?
• 10. ^What symbol does it stand for
• 11. As shown in the figure, a rectangle is divided into four different triangles. The area of the green triangle accounts for 15% of the area of the rectangle. The area of the yellow triangle is 12 square meters more than that of the green triangle. How many square meters is the area of the green triangle?
• 12. As shown in the figure, there are two intersecting line segments Mn, EF in square ABCD, m, N, e, f on edge AB, CD, ad, BC respectively. Student a thinks: if Mn = EF, then Mn ⊥ EF; student B thinks: if Mn ⊥ EF, then Mn = ef. Do you think () A. Neither is right. B. both are right. C. only a is right. D. only B is right
• 13. As shown in the figure, there are two intersecting line segments Mn, EF in square ABCD, m, N, e, f on edge AB, CD, ad, BC respectively. Student a thinks: if Mn = EF, then Mn ⊥ EF; student B thinks: if Mn ⊥ EF, then Mn = ef. Do you think () A. Neither is right. B. both are right. C. only a is right. D. only B is right
• 14. Em, MF, Mn, NH and ng divide the rectangle ABCD into four equal parts, Where FG = BG + BC + CH = eh = de + Da + AF, Mn parallel AB, BC = 19, Mn = 7, find the length of ab The level is too low to pass pictures. Ad and BC are wide, DC and ab are long, e and H are on DC, F and G are on AB, m and N are in rectangular ABCD. Connect dehc, afgb, ad, CB, EM, MF, ng and HN D E H C M N A F G B
• 15. Taking AB and AC of △ ABC as the sides, make square ABCD and ACGF outside the triangle, make an ⊥ BC at point n, extend Na and intersect EF at point m, and prove that EM = MF Square ABDE
• 16. The side length of square ABCD is 4, M is the midpoint of AD, and point E is the moving point of line ab. it connects EM and extends the intersection line CD to F, and makes the intersection line B of EF through M (1) If M passes through point C, the length of AE is obtained (2) Can CG be equal to AE? If so, find the length of AE
• 17. As shown in the figure, in rectangle ABCD, ab = 2ad, line EF = 10. Take a point m on EF, and make rectangle emnh and rectangle mfgn with EM and MF as sides respectively, so that rectangle mfgn ∽ rectangle ABCD. Let Mn = x, when x is the value, the area s of rectangle emnh has the maximum value. What is the maximum value?
• 18. As shown in the figure, in the trapezoidal ABCD, ad ∥ BC, ∠ B = 30 ° and ∠ C = 60 ° e, F, m and N are the midpoint of AB, CD, BC and Da respectively. Given BC = 7 and Mn = 3, then EF=______ ．
• 19. Crazy guess white background, blue, red, yellow square, blue rectangle, a vertical bar, a red square, what brand is it
• 20. Write English words red yellow blue green pink good fast short young small